fix(editor): use versioned dirty state and debounced cache writes, also avoid full string conversion of editor buffer

[bajrangCoder]

• track editor dirty state with version metadata and CodeMirror Text equality
• debounce cache snapshots and flush pending writes on switch/pause/save
• avoid full doc string conversion for tab switches and equality checks
• use mtime metadata for external file change detection
• disable native webview selection menu in terminal
• add setting to change cursor width and set default to 2 instead of 1
• avoid rebuilding state on every tab switch
• improve color view and indent guide extension
• Fixed the terminal touch-selection handle oscillation

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[greptile-apps]

Greptile Summary

This PR introduces versioned dirty-state tracking (docVersion/savedVersion/cacheVersion) and CodeMirror Text equality checks to avoid full string conversions, debounces cache writes with explicit flush points on tab switch and app pause, and adds mtime metadata for external-change detection. Several smaller improvements are bundled: cursor-width setting, terminal native-selection suppression, and performance refactors for colorView and indentGuides.

• editorFile.js — new markLoaded/markSaved/markEdited/markDiskChanged helpers drive dirty state; writeToCache now snapshots docVersion before the await, fixing the stale-cacheVersion race from previous review threads.
• checkFiles.js — adds mtime fast-path and disk-conflict detection, but scheduleCacheWrite(0) after a disk reload is silently skipped by the cacheVersion === docVersion guard that markLoaded just set, leaving the stale cache file on disk.
• saveFile.js — snapshots savedDoc/savedVersion before the write and calls markSaved with a post-write stat() mtime; wraps formatOnSave in try/finally to always restore markChanged.

Confidence Score: 3/5

A cache-staleness regression in checkFiles means a user who accepts reload-from-disk will silently see the old content again after the next restart.

The scheduleCacheWrite(0) call after a confirmed reload is defeated by the cacheVersion===docVersion guard that markLoaded just set, and the mtime shortcut then prevents re-detection on subsequent checkFiles runs. This is a data-visibility regression on the changed code path that needs a targeted fix before the change ships.

src/lib/checkFiles.js and src/lib/editorFile.js (markLoaded / scheduleCacheWrite interaction)

Important Files Changed

Filename	Overview
src/lib/editorFile.js	Core of the PR: adds versioned dirty-state tracking, debounced/flushed cache writes, and markLoaded/markSaved/markEdited/markDiskChanged helpers. The writeToCache version-snapshot fix addresses thread-flagged races, but the scheduleCacheWrite guard silently skips the explicit flush in checkFiles.
src/lib/checkFiles.js	Adds mtime fast-path and disk-conflict detection. The scheduleCacheWrite(0) call after reload is a no-op due to cacheVersion===docVersion guard set by markLoaded, leaving stale cache on disk.
src/lib/saveFile.js	Snapshots savedDoc/savedVersion before the write; formatOnSave now has try/finally to restore markChanged. Async formatters may still bump docVersion past savedVersion after markSaved completes.
src/lib/editorManager.js	Adds cursorWidth compartment, session-reuse optimisation, flushCacheWrites(), and moves markEdited() into the dispatch listener. Changes look correct.
src/cm/colorView.ts	Rewrites ColorViewPlugin to dirty-range tracking with setTimeout batching; adds scan limits and colorRaw to eq(). Solid.
src/components/terminal/terminal.js	Adds disableNativeSelectionMenu() with correct cleanup on destroy(). Called twice but second call correctly replaces first handler.

_{Reviews (7): Last reviewed commit: "Fixed the terminal touch-selection handl..." | Re-trigger Greptile}