Fenced ```mermaid blocks in the Markdown preview render as diagrams. mermaid (12.1.0) is loaded lazily, only when a preview contains a diagram, with securityLevel "strict"; colours come from the theme tokens and diagrams re-render on theme changes. Syntax errors show inline under the source. Rendered diagrams are cached by theme + source, so editing elsewhere in the file doesn't redraw them.
Fixes#79
Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn
Built-in Vim emulation on @replit/codemirror-vim (approved dependency), modelled on IdeaVim: `vim.toggle` (Tools › Vim, status widget, Settings › Editor › Vim), mode widget (NORMAL / INSERT / VISUAL / V-LINE / V-BLOCK / REPLACE), IdeaVim-style shortcut conflict handlers (Vim / IDE per key) through a generic `registerKeyClaim()` in the keymap dispatcher, Escape closing popups first, a safe subset of ~/.openideavimrc / ~/.ideavimrc (set, map variants, mapleader, :action / <Action>()), Ex commands :w :wa :q :qa :wq :x :action. Covers file editors, diff editable side and merge result via a new `embeddedEditorExtensions` extension point.
Verified in the app on macOS: motions/operators, i/Esc/V mode widget, :w saves, Ctrl+R redoes in Vim without running Run, toggling off restores plain editing. Not verified on Windows/Linux.
Fixes#27https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn
Per the maintainer's decision for #24, no third-party themes are bundled; instead a theme plugin template and docs let the community port themes (IntelliJ also ships few themes, the rest are plugins).
- templates/theme-plugin: manifest-only plugin with an original example (Harbor Night) covering every UI token and an editor scheme (.icls equivalent).
- docs/plugins/themes.md: format, IntelliJ / VS Code porting tables, generated token reference (pnpm gen:theme-docs); drift test fails when tokens.css and the template/reference disagree.
- pnpm theme:import-intellij: dependency-free converter for IntelliJ .theme.json (+ .icls).
- Plugin host: themes may name an editor-scheme merged over the theme; comments allowed in theme files.
- Fixes: a plugin theme's kind now switches the light/dark base; plugin themes go in their own stylesheet so the Appearance accent and editor scheme still layer on top.
Verified: ide-plugin tests, vitest (44), in-app on macOS: installed the template from disk, applied Harbor Night (dark base + teal accent over Islands Light), back to default restored the light theme.
Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn
- ide-web: built-in static server on 127.0.0.1 that serves project files,
plus detection and launching of installed browsers.
- Open In › Browser in the editor, project view and tab menus; browser bar
and built-in preview beside HTML editors; ⌃⇧R opens the default browser.
- Emmet: Tab expansion in markup editors and Update Tag with Emmet.
Claude-Session: https://claude.ai/code/session_01SaPPsVPuk6ZTNsoUCNCbMv
The WebGL renderer rasterizes each glyph against its cell background, so
text over the selection came out at a visibly lighter weight than the
rest and looked like a different font. The DOM renderer draws text like
the editor does, selected or not.
Claude-Session: https://claude.ai/code/session_01B65qLEKnkeYTGdbwhLpjCu
l0ng-ai