`source ~/.vimrc` was reported as unsupported, so mappings kept in a shared vimrc had no effect. `source` now reads that file in place by the same rules as the rc file, sharing the leader. Lines it cannot use are listed with the file they came from, and nothing in a sourced file is executed. Unreadable files and files that source themselves are reported.
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
l0ng-ai