fix: improve touch support for sessions app pickers and overlays

[rebornix]

Replace EventType.MOUSE_DOWN with addDisposableGenericMouseDownListener for overlay dismissal in runScriptAction, sessionsWalkthrough, sessionsPolicyBlocked, and sessionsTitleBarWidget. This uses POINTER_DOWN on iOS where pointer events are available.

Add touch-action: manipulation to picker trigger elements and the session title bar pill to eliminate the 300ms tap delay on touch devices.

[github-actions]

Screenshot Changes

Base: 32776b54 Current: 69640829

Changed (1)

editor/inlineCompletions/other/JumpToHint/Dark

Before	After

[Copilot]

Pull request overview

Improves touch interactions in the Agents (sessions) window by making overlay-dismiss and picker-trigger interactions respond more reliably on iOS/touch devices.

Changes:

• Replaces EventType.MOUSE_DOWN listeners with addDisposableGenericMouseDownListener for overlay/backdrop interactions to use pointerdown on iOS when available.
• Adds touch-action: manipulation to picker trigger elements (and the session title pill) to reduce/remove tap delay on touch devices.
• Adds cursor: pointer styling for the session title bar pill to better communicate interactivity.

Show a summary per file

File	Description
src/vs/sessions/contrib/welcome/browser/sessionsWalkthrough.ts	Uses generic mouse/pointer down listener for walkthrough overlay background interactions.
src/vs/sessions/contrib/sessions/browser/sessionsTitleBarWidget.ts	Switches pill “down” handler to generic mouse/pointer down listener for touch support.
src/vs/sessions/contrib/sessions/browser/media/sessionsTitleBarWidget.css	Adds cursor: pointer and touch-action: manipulation to the session title pill.
src/vs/sessions/contrib/policyBlocked/browser/sessionsPolicyBlocked.ts	Uses generic mouse/pointer down listener for policy-blocked overlay background interactions.
src/vs/sessions/contrib/chat/browser/runScriptAction.ts	Uses generic mouse/pointer down listener for run-script modal backdrop dismissal.
src/vs/sessions/contrib/chat/browser/media/chatWidget.css	Adds touch-action: manipulation to chat picker trigger elements.
src/vs/sessions/contrib/chat/browser/media/chatInput.css	Adds touch-action: manipulation to chat config toolbar action labels.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/sessions/browser/sessionsTitleBarWidget.ts:197

• In addDisposableGenericMouseDownListener on iOS this becomes a pointerdown listener. Calling preventDefault() on pointerdown can suppress the subsequent synthetic click event on touch devices, which would prevent the EventType.CLICK handler from firing and stop the sessions picker from opening. Consider removing preventDefault() here (keeping stopPropagation()), or only calling preventDefault() for mouse pointers / moving the picker-open logic to the generic down handler.

			this._dynamicDisposables.add(addDisposableGenericMouseDownListener(sessionPill, (e) => {
				e.preventDefault();
				e.stopPropagation();
			}));
			this._dynamicDisposables.add(addDisposableListener(sessionPill, EventType.CLICK, (e) => {
				e.preventDefault();
				e.stopPropagation();
				this._showSessionsPicker();
			}));

• Files reviewed: 7/7 changed files
• Comments generated: 0