fix: prevent focus stealing when PREVENT_FOCUS_DISRUPTION experiment is enabled

- Modified saveDirectly method in DiffViewProvider to accept openFile parameter instead of openWithoutFocus
- Updated all file editing tools to pass false for openFile when the experiment is enabled
- This ensures files are not opened at all when the experiment is active, preventing any focus stealing

Fixes #6214

Author: daniel-lxs

src/core/tools/applyDiffTool.ts

@@ -173,13 +173,13 @@ export async function applyDiffToolLegacy(
 					return
 				}
 
-				// Save directly without showing diff view
+				// Save directly without showing diff view or opening the file
 				cline.diffViewProvider.editType = "modify"
 				cline.diffViewProvider.originalContent = originalContent
 				await cline.diffViewProvider.saveDirectly(
 					relPath,
 					diffResult.content,
-					true,
+					false,
 					diagnosticsEnabled,
 					writeDelayMs,
 				)

src/core/tools/insertContentTool.ts

@@ -157,8 +157,8 @@ export async function insertContentTool(
 		}
 
 		if (isPreventFocusDisruptionEnabled) {
-			// Direct file write without diff view
-			await cline.diffViewProvider.saveDirectly(relPath, updatedContent, true, diagnosticsEnabled, writeDelayMs)
+			// Direct file write without diff view or opening the file
+			await cline.diffViewProvider.saveDirectly(relPath, updatedContent, false, diagnosticsEnabled, writeDelayMs)
 		} else {
 			// Original behavior with diff view
 			// Show changes in diff view

src/core/tools/multiApplyDiffTool.ts

@@ -560,13 +560,13 @@ ${errorDetails ? `\nTechnical details:\n${errorDetails}\n` : ""}
 				}
 
 				if (isPreventFocusDisruptionEnabled) {
-					// Direct file write without diff view
+					// Direct file write without diff view or opening the file
 					cline.diffViewProvider.editType = "modify"
 					cline.diffViewProvider.originalContent = await fs.readFile(absolutePath, "utf-8")
 					await cline.diffViewProvider.saveDirectly(
 						relPath,
 						originalContent!,
-						true,
+						false,
 						diagnosticsEnabled,
 						writeDelayMs,
 					)

src/core/tools/searchAndReplaceTool.ts

@@ -230,8 +230,8 @@ export async function searchAndReplaceTool(
 		}
 
 		if (isPreventFocusDisruptionEnabled) {
-			// Direct file write without diff view
-			await cline.diffViewProvider.saveDirectly(validRelPath, newContent, true, diagnosticsEnabled, writeDelayMs)
+			// Direct file write without diff view or opening the file
+			await cline.diffViewProvider.saveDirectly(validRelPath, newContent, false, diagnosticsEnabled, writeDelayMs)
 		} else {
 			// Original behavior with diff view
 			// Show changes in diff view

src/core/tools/writeToFileTool.ts

@@ -222,8 +222,8 @@ export async function writeToFileTool(
 					return
 				}
 
-				// Save directly without showing diff view
-				await cline.diffViewProvider.saveDirectly(relPath, newContent, true, diagnosticsEnabled, writeDelayMs)
+				// Save directly without showing diff view or opening the file
+				await cline.diffViewProvider.saveDirectly(relPath, newContent, false, diagnosticsEnabled, writeDelayMs)
 			} else {
 				// Original behavior with diff view
 				const completeMessage = JSON.stringify({

src/integrations/editor/DiffViewProvider.ts

@@ -641,7 +641,7 @@ export class DiffViewProvider {
 	async saveDirectly(
 		relPath: string,
 		content: string,
-		openWithoutFocus: boolean = true,
+		openFile: boolean = true,
 		diagnosticsEnabled: boolean = true,
 		writeDelayMs: number = DEFAULT_WRITE_DELAY_MS,
 	): Promise<{
@@ -658,8 +658,9 @@ export class DiffViewProvider {
 		await createDirectoriesForFile(absolutePath)
 		await fs.writeFile(absolutePath, content, "utf-8")
 
-		// Open the file without focus if requested (to capture diagnostics)
-		if (openWithoutFocus) {
+		// Only open the file if explicitly requested
+		// This prevents focus stealing when the experiment is enabled
+		if (openFile) {
 			await vscode.window.showTextDocument(vscode.Uri.file(absolutePath), {
 				preview: false,
 				preserveFocus: true,