Add .git/subtree-cache/ to files.watcherExclude (#26665)

src/vs/workbench/parts/files/browser/files.contribution.ts

@@ -261,7 +261,7 @@ configurationRegistry.registerConfiguration({
 		},
 		'files.watcherExclude': {
 			'type': 'object',
-			'default': platform.isWindows /* https://github.com/Microsoft/vscode/issues/23954 */ ? { '**/.git/objects/**': true, '**/node_modules/*/**': true } : { '**/.git/objects/**': true, '**/node_modules/**': true },
+			'default': platform.isWindows /* https://github.com/Microsoft/vscode/issues/23954 */ ? { '**/.git/objects/**': true, '**/.git/subtree-cache/**': true, '**/node_modules/*/**': true } : { '**/.git/objects/**': true, '**/.git/subtree-cache/**': true, '**/node_modules/**': true },
 			'description': nls.localize('watcherExclude', "Configure glob patterns of file paths to exclude from file watching. Changing this setting requires a restart. When you experience Code consuming lots of cpu time on startup, you can exclude large folders to reduce the initial load.")
 		},
 		'files.hotExit': {