Stop the cursor from jumping when changing prefix in QuickAccess (microsoft#198821)

Author: a-stewart

src/vs/base/browser/ui/inputbox/inputBox.ts

@@ -305,6 +305,18 @@ export class InputBox extends Widget {
 		return this.input.selectionEnd === this.input.value.length && this.input.selectionStart === this.input.selectionEnd;
 	}
 
+	public getSelection(): IRange | null {
+		const selectionStart = this.input.selectionStart;
+		if (selectionStart === null) {
+			return null;
+		}
+		const selectionEnd = this.input.selectionEnd ?? selectionStart;
+		return {
+			start: selectionStart,
+			end: selectionEnd,
+		};
+	}
+
 	public enable(): void {
 		this.input.removeAttribute('disabled');
 	}

src/vs/platform/quickinput/browser/quickAccess.ts

@@ -92,6 +92,9 @@ export class QuickAccessController extends Disposable implements IQuickAccessCon
 			}
 		}
 
+		// Store the existing selection if there was one.
+		const visibleSelection = visibleQuickAccess?.picker?.valueSelection;
+
 		// Create a picker for the provider to use with the initial value
 		// and adjust the filtering to exclude the prefix from filtering
 		const disposables = new DisposableStore();
@@ -148,6 +151,11 @@ export class QuickAccessController extends Disposable implements IQuickAccessCon
 		// on the onDidHide event.
 		picker.show();
 
+		// If the previous picker had a selection, we should set that in the new picker.
+		if (visibleSelection) {
+			picker.valueSelection = visibleSelection;
+		}
+
 		// Pick mode: return with promise
 		if (pick) {
 			return pickPromise?.p;

src/vs/platform/quickinput/browser/quickInput.ts

@@ -725,7 +725,15 @@ export class QuickPick<T extends IQuickPickItem> extends QuickInput implements I
 		return this.ui.keyMods;
 	}
 
-	set valueSelection(valueSelection: Readonly<[number, number]>) {
+	get valueSelection() {
+		const selection = this.ui.inputBox.getSelection();
+		if (!selection) {
+			return undefined;
+		}
+		return [selection.start, selection.end];
+	}
+
+	set valueSelection(valueSelection: Readonly<[number, number]> | undefined) {
 		this._valueSelection = valueSelection;
 		this.valueSelectionUpdated = true;
 		this.update();
@@ -1154,7 +1162,15 @@ export class InputBox extends QuickInput implements IInputBox {
 		this.update();
 	}
 
-	set valueSelection(valueSelection: Readonly<[number, number]>) {
+	get valueSelection() {
+		const selection = this.ui.inputBox.getSelection();
+		if (!selection) {
+			return undefined;
+		}
+		return [selection.start, selection.end];
+	}
+
+	set valueSelection(valueSelection: Readonly<[number, number]> | undefined) {
 		this._valueSelection = valueSelection;
 		this.valueSelectionUpdated = true;
 		this.update();

src/vs/platform/quickinput/browser/quickInputBox.ts

@@ -59,6 +59,10 @@ export class QuickInputBox extends Disposable {
 		this.findInput.inputBox.select(range);
 	}
 
+	getSelection(): IRange | null {
+		return this.findInput.inputBox.getSelection();
+	}
+
 	isSelectionAtEnd(): boolean {
 		return this.findInput.inputBox.isSelectionAtEnd();
 	}