Does this issue occur when all extensions are disabled?: No

Version: 1.109.0-insider (user setup)
Commit: bdd88df
Date: 2026-02-04T02:00:40.203Z
Electron: 39.3.0
ElectronBuildId: 13168319
Chromium: 142.0.7444.265
Node.js: 22.21.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.26200

Steps to Reproduce:

1. Open VSCode Insiders
2. Open settings
3. Set theme Darkula, install if not available (https://marketplace.visualstudio.com/items?itemName=alex-pex.theme-darkula)
4. Create .js file with code

const test = (arg) => {
  return arg;
}

test("test-sample");

5. Double click on first or last symbol in string

Extepected: full string in double quotes to be selected

Actual: string is selected without first and last symbols

Issue appeared a few weeks ago. I have checked theme extension alex-pex.theme-darkula, it was updated a log time ago. This mean, the issue is with one of latest updates of vscode.

Also I have check theme file itself, and tried to modify it, to fix issue. And found the cause, may be. Removing this part, fixes issue, but it breaks highlight.

		<dict>
			<key>name</key>
			<string>Punctuation</string>
			<key>scope</key>
			<string>punctuation</string>
			<key>settings</key>
			<dict>
				<key>foreground</key>
				<string>#808080</string>
			</dict>
		</dict>

There is the file: darkula.tmTheme.zip

This issue reproduces not only on one theme, but on other themes too, not on all.