ReShiki 0.13.0

ReShiki 0.13.0 shows molecules as 3D models (ball & stick, stick, wireframe and space-filling) beside or in place of their drawings, and opens crystal structures from CIF, PDB, POSCAR and XYZ files with their unit cell. The full editor now also runs in a web browser, as a preview on reshiki.com/demo and as the @ameyanagi/reshiki npm package, with naming and NMR prediction. Typing groups, the command palette and many drawing details work better, and large drawings pan, zoom, edit and export much faster. Installed applications still work on your computer without Python, RDKit or uv.

File compatibility

Drawings saved in 0.13.0 use document version 29, even when they use none of the new features. ReShiki 0.12.x and earlier cannot open them; ReShiki 0.12 says that the drawing was made with a newer version and asks you to update. Older drawings still open in 0.13.0. If you share files with people on 0.12, keep a copy saved by 0.12.

Highlights

• Show a molecule as a 3D model, or Both 2D and 3D, from the right-click Show as menu. Choose ball & stick, stick, wireframe or space-filling, then rotate and resize the model on the canvas. Exports draw it as vectors.
• Open CIF, PDB, POSCAR/CONTCAR and XYZ crystal files. They open as 2D drawings with their unit cell, and can repeat cells and look along an axis.
• Try the editor in your browser at reshiki.com/demo, or embed it in your own page with bun add @ameyanagi/reshiki. Naming and NMR prediction work there too.
• Type 359 group abbreviations, define your own, and run any command from the command palette (:).
• Pan, zoom, hover, edit, copy and export large drawings much faster, with less memory for Undo and long stereo chains.

Previous release: ReShiki 0.12.0. The changes below keep their contributor credits and links to their issues and reviews.

3D models

• 3D models of structures. Select a molecule and choose 2D, 3D or Both from the right-click Show as menu, the command palette or Properties → Structure to show it as a vector model in place of its drawing or beside it. The conformer comes from the 3D optimize worker (ETKDG, then MMFF94s) and is kept for switching back; each switch is one Undo step, and chemistry, atom IDs and the 2D layout never change. When a model appears, its atoms move from the drawing into 3D and the hydrogens grow out. Clicking the model selects its molecule; a chemical edit removes the model. Flipping, resizing (except the model’s own corner handles), cleaning up, optimizing or joining a molecule shown only in 3D asks you to switch to 2D, and rings never fuse onto its hidden bonds. .rsk files keep models, and PNG, SVG and PDF draw them. 3D models · Issue #386 · @Ameyanagi.
• Rotate, resize and flatten a model. Once a shown model is selected, drag inside its frame to rotate it, Shift-drag to roll it and double-click to reset the view; corner handles resize the frame. An unselected model, or its frame’s edge, still drags to move. Going back to 2D can keep the Original drawing or flatten the model From the 3D view as it is turned now, with far bonds lighter, like 3D optimize. The 3D tilt tool, its X/Y step commands and the Tilt X / Tilt Y fields turn the model of a molecule shown as 3D or Both and leave its 2D drawing as drawn. The rotation handle, Rotate 180°, the rotate step keys and the Rotate field roll a 3D-only model about the view axis; a flip leaves it alone, since a mirrored model would be the other enantiomer. Each rotation, tilt, resize and flatten is one Undo step, and every drag commits exactly what it previews. 3D models · Issue #386, #401 · @Ameyanagi.
• Styles and the 3D model panel. Properties → 3D model offers Ball & stick, Stick (tubes with mitered joints and one outline round their outer edge), Wireframe and Space-filling (van der Waals radii), each with a pictogram; a Flat · journal or Glossy · slides look; All, Polar or None hydrogens; Depth fade and Perspective sliders; a None or Soft card background; and Reset view. Model colours follow the drawing’s colour theme and canvas (Publication uses Presentation’s colours, with a light grey hydrogen); on a dark canvas the flat look’s outline is a soft light rim and the soft card is dark. Each change is one Undo step, a slider drag included. Balls shade smoothly without rings at any zoom, and each bond’s shading runs on across its colour change. 3D models · Issue #386 · @Ameyanagi.
• Space-filling balls meet in true seams. Overlapping atoms show only the part of each ball in front, so two atoms meet along the curve where their spheres cross. The Flat · journal look outlines only the visible edges and seams. There is no contact shadow, so a model draws as quickly at rest as while it turns, and exported figures stay small. An atom hidden inside another is not drawn. The canvas and PNG, SVG, PDF and Office SVG exports draw the same vector shapes. 3D models · Issue #455 · @Ameyanagi.
• Show as moves out of the way. Selecting a molecule no longer pops up a floating Show as bar. Use the right-click Show as menu, the command palette (Show as 3D model, Show as 2D and 3D, Show as 2D drawing, Show as 2D from the 3D view) or Properties → Structure. In Properties, the Structure and 3D model sections follow Molecular properties and Labels & chemistry, before Drawing style. 3D models · Issue #422 · @Ameyanagi.
• Show as 3D with a name caption. A molecule imported with Import → Name → Add name below now shows as 3D or Both and keeps its caption attached. Arrow condition text, another molecule’s depth fade or another molecule’s link node no longer stop a model either. A molecule with a link node or repeating unit of its own still can’t be shown in 3D, and says so. Issue #409 · @Ameyanagi.

Crystal structures

• Open crystal structures. Open, Import and drag-and-drop read CIF, PDB, VASP POSCAR/CONTCAR (also *.vasp), plain XYZ and extended XYZ (.extxyz) files. CIF symmetry operators are expanded, keeping atoms on the cell boundary once and the first alternative of disordered sites; bonds come from covalent radii across the cell boundary. Molecular crystals keep whole molecules, and extended networks such as NaCl keep each atom once. Saved .rsk files keep the lattice, atoms, labels, charges, bonds and CIF displacement parameters, not the rest of the file. Crystal structures · Issue #417 · @Ameyanagi.
• Crystals open as 2D drawings. A file with a unit cell opens as a 2D drawing with depth: a parallel projection with the cell box, dashed hidden edges, an origin dot and a, b, c labels placed clear of the box, and short, light dashed stubs where bonds leave the cell. A linear carbon shows its C (O=C=O), molecules get their double bonds (urea has C=O), atom labels sit on a paper halo over the box, and a bond behind another shows a gap. Ion charges stay hidden until Properties → Structure → Ion charges → Show. The opening view keeps labels, bonds and box edges apart. Show as 3D shows the structure as a 3D model in its cell, with the usual styles, and the box turns with the model and appears in PNG, SVG and PDF export. Crystal structures · Issue #439 · @Ameyanagi.
• Supercells and Look along. Properties → Structure has Repeat (1–4 cells along each of a, b and c) and Look along a, b, c or [111] for a crystal drawn in 2D, each one Undo step and kept in the file. The other cells are lighter copies that follow the editable cell. As crystallographers draw a cell, atoms on the origin’s faces, edges and corners are also shown on the far ones, so rock salt shows all 27 ions; the drawing still holds each atom once. Crystal structures · Issue #417 · @Ameyanagi.
• VESTA colour theme. Theme → VESTA colours elements with VESTA’s element colours (K. Momma and F. Izumi, https://jp-minerals.org/vesta/), via pymatgen’s ElementColorSchemes.yaml (MIT), for H through Mt. Labels darken or brighten only as needed for 5:1 contrast on light and dark paper. Manage themes… → Reference theme offers VESTA next to Jmol, which stays the default, and theme files accept "base": "vesta". Colour palettes · Issue #420 · @Ameyanagi.

The editor in a web browser

• Browser preview. The full editor runs in the browser (WebGPU, with WebGL2 as a fallback) at reshiki.com/demo, linked from the home page and the install guide. It is a preview, not the full app: naming and NMR prediction work, but printing, the assistant and Office integration need the desktop app, and 3D models pause the page while they are computed. Your files stay on your computer. The editor’s JavaScript and WebAssembly have an estimated first download of 9 MB compressed (gzip -9). The naming worker loads on demand; Japanese, Korean or Chinese text may also download a font from jsDelivr. Install guide · Issue #405 · @Ameyanagi.
• The demo page shows its progress. reshiki.com/demo shows a progress bar while the editor downloads, and a message with a Reload button and a desktop-app link when the browser has neither WebGPU nor WebGL 2 or the download fails. The editor’s JavaScript and WebAssembly download together instead of one after the other. On a phone the page says ReShiki is made for a computer and waits to download the editor’s WebAssembly until you choose Continue anyway. The “Browser preview” note is a banner above the editor instead of floating over the canvas, menus and status bar, and the page has a favicon, a description and a link preview. PR #461 · Issues #433, #434 · @Ameyanagi.
• Name ↔ structure conversion. Import → Name and Generate selected name work in the browser editor instead of saying “Naming is not available in the browser yet”. The OPSIN Rust port and naming rules run in the editor’s own Web Worker and WebAssembly module (dist/worker/, 2.3 MB gzipped), loaded on the first conversion, so drawing and typing carry on while a name is read. As on the desktop, a request stops after 15 seconds and its heap is capped at 96 MiB, and the next request starts a new worker. The parser’s resources also take less memory, on the desktop too: 7.5 MiB instead of 33.8 MiB after loading. Package README · PR #471 · Issue #430 · @Ameyanagi.
• NMR prediction. Predict NMR (the Predict tab, Properties → Predict NMR… and the command palette) predicts ¹H and ¹³C shifts in the browser editor, with the same bundled data and report as the desktop app, instead of saying it needs the desktop app. The prediction runs on the page’s own thread, so the page pauses while it runs, at most about 3 seconds; the busy state shows first. PR #465 · Issue #430 · @Ameyanagi.
• Only what the browser can run. The Assistant button, the command palette’s AI assistant and Assistant panel, and Print… with Cmd/Ctrl+P no longer appear in the browser editor, since each only said it needs the desktop app. Clicking the ReShiki logo opens About ReShiki with the version and a Get the desktop app ↗ link instead of an update check that always failed. PR #469 · Issue #434 · @Ameyanagi.
• The npm editor recovers and reports errors. After the editor’s WebAssembly fails to download once, the next mount() tries again instead of failing until the page is reloaded. A <reshiki-editor src> that answers with an HTTP error, such as a 404 page, fires error with Could not load <src>: HTTP 404 instead of reading the page as a drawing. On a page whose Content-Security-Policy keeps style-src strict, the editor fills its element instead of shrinking to a 300×150 canvas, and the package README lists what the editor needs. Package README · PR #468 · Issue #431 · @Ameyanagi.
• Docs match the browser editor. The npm README, the install guide and the home page no longer say that 3D needs the desktop app (3D models work but pause the page while they compute), that drawing styles, themes, templates and pictures cannot be loaded from files, that Insert cannot insert files, that copy and paste carry text only or that there are no recovery drafts. All three say that naming and NMR prediction work in the browser editor. Install guide · PR #460 · Issue #434 · @Ameyanagi.
• @ameyanagi/reshiki on npm. bun add @ameyanagi/reshiki installs the editor for your own page: mount(element) with load, save, exportImage, onChange and destroy, a <reshiki-editor> element, and embed() for an editor in an iframe. mount() also offers isDirty(), onDirtyChange, onTitleChange, fonts and cjkFont. A headless library converts between .rsk, MOL, SMILES, CDXML, CDX and InChI and renders SVG, PNG and PDF, with SMILES, MOL, InChI and CDXML output identical to the desktop CLI on the tested structures. Each version tag publishes the package with the app’s version and npm provenance. Package README · Issues #396, #400, #411 · @Ameyanagi.
• Files. Open, Import → Choose file…, Drawing style → Load, Theme → Import, Templates → Import… and the picture inspector’s Replace use the browser’s own file chooser. Dropping structure, crystal or picture files inserts them, and dropping drawings opens them in tabs. Issue #428 · @Ameyanagi.
• Copy and paste. Cmd/Ctrl+C puts a PNG picture of the selection on the clipboard, the same picture as HTML for Word, Google Docs and mail, and SMILES as text; pasting it back into a browser editor keeps the drawing editable. Cmd/Ctrl+V pastes ReShiki drawings, chemical text and PNG pictures, and text fields reach the system clipboard. Browsers cannot hold PDF or CDX on the clipboard, so Copy as → PDF and CDX point to Export. Clipboard · Issues #425, #429 · @Ameyanagi.
• Shortcuts. On a Mac, ⌘ is the Command key as in the desktop app, also in text fields, and menus show ⌘, ⇧, ⌥ and ⌃. Browsers keep Ctrl/⌘+N, W and Tab, so New is Alt+N, Close tab Alt+W and Next / previous tab Alt+] / Alt+[ (⌃N, ⌃W and ⌃] / ⌃[ on a Mac). Keys · Issue #424 · @Ameyanagi.
• Work is kept. Reloading or closing the tab with unsaved changes asks first, and closing an unsaved editor tab asks Save, Don’t Save or Cancel. Recovery drafts of unsaved drawings are kept in browser storage and offered after a reload or crash. Settings, templates, themes, your own abbreviations and added fonts are kept in the browser’s storage too. Issues #426, #427 · @Ameyanagi.
• Text and colours. Japanese, Chinese and Korean input methods type into text fields and captions. Japanese, Korean and Chinese labels and file names load a fallback font instead of showing empty boxes, interface symbols draw, and panels and 3D models are no longer drawn darker than in the desktop app. Issues #400, #410, #429 · @Ameyanagi.
• Updates load cleanly. The demo’s JavaScript and WebAssembly are named by content hash, so a browser never mixes two releases after an update. Release builds · Issue #433 · @Ameyanagi.
• Privacy policy. The privacy policy now covers the Cloudflare Web Analytics that reshiki.com adds to every page, the browser preview included, and the font the preview downloads for Japanese, Korean or Chinese text. No drawing data reaches either service. Issue #433 · @Ameyanagi.

Typing groups and labels

• 359 abbreviations. The catalog adds protecting groups (Alloc, Teoc, SEM, THP, DMTr, Mtt, Pbf, Dde, ivDde, Acm and the carbohydrate set such as OBn, OTBS, OPMB, NHAc, NHBoc, OTr, OTf), carbonyl and acid derivatives, sulfonyl, phosphorus, boron, tin and zinc groups, amines and aryl and heteroaryl rings. Every group’s formula was checked against its SMILES, and every label is tested by typing it on a bond end. Contract common groups can now prefer a larger group such as NHCbz, OTMS or SO2Ph. Aliases such as TBDMS, MPM and Trt create their groups. Group list · PR #348, #362, #364 · @Ameyanagi.
• Your own abbreviations. Select a group with one bond to the rest of the drawing, enter a label and choose Define abbreviation from selection. Typing that label on any endpoint then creates the real group, and Contract common groups finds it. Your own groups · PR #363 · @Ameyanagi.
• Reverse spellings. MeO typed on a bond end gives OMe, TBSO gives OTBS, O2N gives NO2 and (HO)2B gives B(OH)2, each shown in whichever spelling suits the free side. A full name such as morpholino stays text, and the label editor suggests the label to type (“Did you mean Morph?”). A group typed over a label that reads to the left keeps that side, so OBn typed on glucose’s C4 HO reads BnO. Typing groups · Issues #376, #377 · @Ameyanagi.
• Bonds meet the attachment atom. In labels such as MeO, AcS or SPh, the bond meets the O or S instead of the middle of the label. A Bond attachment (text labels) setting chooses flush left, centered, flush right or a specific character, and Flush left and Centered labels come back unchanged after a round trip through ChemDraw. Atom labels · PR #360 · Issue #378 · @Ameyanagi.
• Labels sit where they fit. An alternative list such as [Cl,Br,I] on a horizontal bond meets the bond with its near edge, a longer custom atom number grows away from the drawing, and atom-map numbers stack above or below element labels. PR #345, #354, #365 · @Ameyanagi.
• Smaller circled charges. A circled charge (⊕/⊖) on an atom draws with a circle 0.80 × its mark size across, so it no longer stands taller than an O. The stored size is unchanged, so ChemDraw round trips keep the same size. Issue #388 · @Ameyanagi.
• Attached marks orbit their atom. Dragging an attached lone pair, charge or radical moves it around the atom in 15° steps just outside the label, skipping steps that would touch a bond. Hold Option/Alt or Shift to place it freely. Chemical symbols · Issue #387 · @Ameyanagi.
• Automatic label alignment. The Style bar’s alignment menu offers Automatic, Left, Center, Right and Stacked above when atom or group labels are selected, with Automatic checked by default, as ChemDraw’s Text menu does. Automatic reads the label from its bonds (HO on a left-pointing bond, OH on a right-pointing one, MeO and OMe), and choosing it again returns a label forced to Left, Center or Right to automatic. It covers element labels (Left reads OH, Right HO) and free text labels as well as groups, and replaces the group-only Auto / above list. The Edit atom label dialog gains an Alignment list, Automatic by default. Captions keep Left / Center / Right / Justify. Chemical abbreviations · PR #466 · Issue #458 · @Ameyanagi.
• The Text tool keeps and repeats labels. Clicking or double-clicking another atom while typing a label commits it, as Enter does, instead of throwing it away, and so does a click anywhere else outside the label editor. The Text tool stays active after a label is committed. Double-clicking another atom, or Option/Alt-clicking it as in ChemDraw, puts the last label on it at once without opening the editor, so OMe typed once can go on atom after atom. Click an atom to change a repeated label. Each labelled atom is its own Undo step, and Escape or switching tools forgets the label. Drawing tools · PR #467 · Issue #457 · @Ameyanagi.

Commands and drawing

• Command palette. Press : to search every command, such as benzene, OMe, double bond, Predict NMR or an export format, and run it with Enter on the selection or the pointed atom or bond, as one Undo step. Results are one line each, with category chips and the selected command’s description. Search words match prefixes, initials (bt), letters in order and one typo; value commands such as rot 30, tilt x -15 and scale 150 take a number. Vim-style :w, :q and :wq run file commands. Run a command · PR #361 · Issues #372, #403 · @Ameyanagi.
• Shortcut finder. Help (?, F1 or Cmd/Ctrl+Shift+/) is a searchable list of every shortcut, with live before/after drawings for atom and bond keys. Shortcuts guide · PR #357 · @Ameyanagi.
• Arrow length follows its condition text. Text typed or dropped above or below a straight reaction arrow attaches to it, stays centred and keeps the arrow at least as long as the text. Arrow conditions · PR #359 · @Ameyanagi.
• Rotation. Drag with a ring tool to turn the ring in 15° steps toward the pointer (Option/Alt rotates freely). The rotation handle shows the angle and the step keys, a ° field rotates the selection by a typed angle, and a 3D tilt drag keeps turning past 75°, all the way round. Selection handles · PR #355, #358 · Issue #389 · @Ameyanagi.
• H in the ATOMS palette. The ATOMS buttons at the bottom of the tool palette start with H, which picks H for the Atom tool like the other element buttons. They read H C / N O / S P / F Cl / Br Fe / *, so H and C show without scrolling the palette at the default window size. Issue #456 · @Ameyanagi.
• Word-aware caption wrapping and reshiki --version. Wrapped text breaks only between words, or next to CJK characters. reshiki --version prints the version and exits without opening a window. PR #343 · @Ameyanagi.
• Exports named after the drawing. PNG, SVG, PDF and structure exports suggest the saved drawing’s name, such as aspirin.png for aspirin.rsk, instead of always Molecule.png; an untitled drawing still suggests Molecule. This applies to the desktop save dialog and to browser downloads. In the browser editor, downloads carry their file type, and Save says “Untitled.rsk sent to browser downloads” instead of “Document saved”. PR #463 · Issue #428 · @Ameyanagi.

Performance

Measured on the shortcut examples (483 atoms), or on those examples tiled 16 times (7,700 atoms). Drawings, labels, files and exports look the same as before.

• Panning and zooming. Scrolling, panning and zooming only move the view instead of also running the whole edit pipeline (copying and comparing the drawing, checking it and the Undo history) on every scroll tick, so they stay smooth on drawings with thousands of atoms. They add no Undo step and leave the drawing unchanged and saved; layout that depends on computed labels is repaired as the labels land. PR #474, #488 · @Ameyanagi.
• Building the scene. After an edit, the drawing’s shapes look atoms and bonds up in an index made once per build, instead of scanning the whole drawing for every atom label, double bond, bond end and ring circle. A build takes about 160 ms instead of 600 ms on 7,700 atoms, and about 21 ms instead of 40 ms on 1,900 atoms. PR #485 · @Ameyanagi.
• Redraws when zoomed in. The canvas skips bonds, shapes, lines and label halos that lie entirely outside the window before turning them into triangles. Zoomed in on 7,700 atoms, drawing the scene takes about 1 ms instead of 8–12 ms, with the same pixels on screen. PR #479 · @Ameyanagi.
• Zooming text. The canvas outlines text at quarter-octave zoom steps and scales the small remainder, and a full text cache drops the outlines used least recently instead of all of them. A zoom frame of the 483-atom examples takes 1.5 ms instead of 11 ms and allocates 1.6 MB instead of 10 MB. At ½×, 1×, 2× and the other steps text draws pixel for pixel as before; between steps, glyph edges can move by about one pixel. PR #482 · @Ameyanagi.
• Hover. Finding the atom label under the pointer, on every mouse move, skips atoms whose labels cannot reach the pointer instead of laying out every label. Each check takes about 1 ms or less instead of 0.7–1.0 s on 7,700 atoms, and 0.1–0.3 ms instead of 17–20 ms on 1,900 atoms. PR #473 · @Ameyanagi.
• Edits with many group labels. Moving or editing atoms in a drawing with many collapsed groups (such as Boc, OTBS or CO2Et) no longer rescans every bond and atom once per group. A move on 7,700 atoms with 256 group labels commits in about 17 ms instead of 50 ms. Which groups stay collapsed is unchanged. PR #481 · @Ameyanagi.
• Unsaved-changes check. The unsaved-changes dot in the window title and tab strip compares the drawing with the saved one once per update instead of three times, without copying every atom and bond: about 0.3 ms instead of 6.5 ms per update on 7,700 atoms. Undoing back to the saved drawing still clears the dot. PR #475 · @Ameyanagi.
• Undo memory. Each tab’s Undo history keeps at most about 128 MB of drawing copies, dropping the oldest steps first but always keeping at least twenty. Drawings of up to about 1,700 atoms keep all 100 steps as before; a 7,700-atom drawing keeps 22 steps in 122 MB instead of 100 steps in 553 MB. Redo is unchanged. PR #472 · @Ameyanagi.
• Copy and export. Copying as PDF or a picture, and exporting PNG, PDF or Office SVG, no longer loads and scans every installed font each time, and the default label font (Arial) is read from disk once. A PDF of the 483-atom examples takes about 40 ms instead of 350–550 ms, and of 7,700 atoms about 2.4 s instead of 8.5–11 s. The files are the same as before. PR #478 · @Ameyanagi.
• Turning 3D models and crystal repeats. While you turn or tilt a space-filling or ball & stick model, its balls draw whole, back to front, at screen resolution; seams and sharp Retina rendering return when you let go. A dense 512-atom space-filling model turns at about 0.15–0.18 s per frame instead of 0.6–1.6 s. Each model’s seams and each crystal repeat’s lighter copies are kept, so an edit beside a 4 × 4 × 4 rock-salt repeat takes about 1 ms instead of 0.43–0.48 s. The canvas keeps at most 64 MB of rendered 3D tiles instead of 128 MB, and none once no model is shown in 3D. PR #484 · @Ameyanagi.
• 2D layout of long chains and polymers. Laying out a long chain or polymer from SMILES, a name or a structure without coordinates is about 3–10× faster: polystyrene with 75 units takes 0.4 s instead of 2.8 s, and poly-alanine with 200 units 0.4 s instead of 3.8 s. Polystyrene with 100 units now lays out instead of failing with “Depiction collision work or storage limit exceeded”, and a still larger molecule whose overlap repair runs out of work keeps its layout before that repair instead of failing. PR #477 · @Ameyanagi.
• R/S and E/Z labels on long stereo chains. Stereo labelling keeps one centre’s ranking data at a time instead of all of them, so a chain with 300 stereocentres peaks at about 6 MB instead of 76 MB. Chains with 400 or more centres, which failed with “CIP resource limit exceeded” and showed no labels, are now labelled. PR #476 · @Ameyanagi.
• Browser editor memory. Fonts the browser editor keeps for later visits, such as the Japanese and Korean fallbacks, stay in browser storage until text needs them instead of being loaded into memory on every visit. With Noto Sans JP and KR saved (9.2 MB), the editor starts in 41.4 MiB instead of 59.0 MiB. The browser editor also drops the desktop worker allocator, so its WebAssembly is 140 KB smaller. The desktop app is unchanged. PR #483 · @Ameyanagi.

Fixes

• Curved arrows move clear of a new H or R/S or E/Z label, and a linked name caption below a molecule clear of a new stereo label, as soon as the labels appear instead of on the next edit, pan or zoom. The move belongs to the edit, so one Undo still returns to the drawing before it, and opening a file makes the same move without marking it as changed (#488).

• Curved arrows keep their heads off bond lines, also after you aim their end, and clicking any visible stroke of a double or triple bond picks it as the arrow’s target (#344, #352, issue #379).

• On 3D cages such as C60, bonds behind the cage are hidden cleanly wherever front bonds, rails or ring circles cover them (#356).

• Orbital lobes draw whole, with atom labels on top in a halo (#353).

• Automatic hydrogens stay clear of nearby labels and charges (#351).

• Pasting part of a ChemDraw drawing recalculates hydrogens at the cut bonds (#347).

• Aligning mapped reactions moves the product plus with its participants (#346).

• Generic structures: small list products expand within the work allowance, list labels stay off the ring, the source tab’s status settles after an expansion, and [CH2]1-3 is described as a repeat (#340, #349).

• Ferrocene drawn with the Cp shortcut is neutral (#341).

• CO2Me stays a real group when its count is subscripted with Cmd/Ctrl+- (#338).

• The NMR palette’s scrollbar stays off the results, and every row fits (#339).

• Escape closes status-bar drop-downs such as the theme menu (#342).

• Import → Name with a salt such as sodium chloride says that salts and mixtures aren’t supported yet and suggests drawing the ions or pasting SMILES (issue #380).

• Intel Macs no longer crash when a background task recovers from a panic (#328).

• Windows uses Direct3D 12 consistently when it picks a graphics adapter, fixing a startup failure seen in a Windows sandbox. Installer antivirus detections remain under vendor review (#327, investigation and limits).

All fixes above are by @Ameyanagi.

Known limits and pending checks

• Browser preview: printing, the assistant and Office integration need the desktop app. NMR prediction, long 3D generation, cleanups and imports pause the page. Fonts installed on the computer are not listed without a permission prompt, so other fonts show a substitute.
• 3D models: a molecule with a link node or repeating unit can’t be shown in 3D. A flip leaves a model alone, since a mirrored model would be the other enantiomer.
• Crystals: CIF files keep only the first alternative of disordered sites.
• Windows signing: public Windows downloads are unsigned while the SignPath Foundation release certificate is pending.

Build and verification

• COSMolKit 0.5.0. InChI, 3D generation and MMFF94, MMFF94s and UFF use COSMolKit 0.5.0 instead of a patched 0.3.0 branch. Generated 3D starting geometries for a given seed can differ from earlier versions. Issue #369 · @Ameyanagi.
• Nix flake. nix run github:Ameyanagi/ReShiki builds and runs ReShiki on Linux (x64 and ARM) and Apple Silicon Macs, with an InChI and PNG export check after building. Install guide · PR #366 · @Stefanomarton.
• Browser build checked on every pull request. A Browser build (wasm32) job runs Clippy on the browser editor and headless library and the packages/editor tests. Development · Issue #432 · @Ameyanagi.
• 0.12.0 release validation. The record of the tagged source, tag runs, publishing run and public downloads. Validation record · PR #324 · @Ameyanagi.
• Release preparation. Update the version, the release notes and the documentation for 0.13.0. Validation record · @Ameyanagi.