[BUG] Dock preview only shows on click with multiple windows, and clicking does nothing when Applications Preview is disabled

Description of the issue

The dock window preview does not behave as documented. According to the official features page (https://seelen.io/apps/seelen-ui/customizable-shell), under "Window Previews": "Hover over any dock item to see a live thumbnail preview of the window."

In practice there are two deviations:

1. Hovering over a dock item does not show a thumbnail preview. It only shows a text tooltip with the application name.
2. The thumbnail preview appears only on click, and only when the app has more than one window open. For apps with a single window, no preview is shown at all — neither on hover nor on click.

I waited several seconds while hovering to rule out slow thumbnail generation. The preview never appears.

To reproduce

1. Enable the Dock/Taskbar widget and the Applications Preview widget
2. Open an application with a single window (e.g. Google Chrome or File Explorer)
3. Hover over its icon in the dock and hold the cursor there
4. Only the application name is shown, no thumbnail
5. Open a second window of the same app and click the dock item — the thumbnail preview now appears

Expected behavior

Hovering over any dock item shows a live thumbnail preview of the window, regardless of how many windows the app has open, as described in the documentation.

Actual behavior

Hover shows a text tooltip only. Preview requires a click and at least two windows of the same app.

Additional context

This happens with every application I tested, not a specific one. I'm not sure whether the current behavior is intended and the documentation is outdated, or whether this is a regression — it would be helpful to know which is expected.

splitWindows is set to false in my dock config, so windows are grouped into a single item.

Related: dock item click does nothing when Applications Preview is disabled

If the Applications Preview widget is disabled, clicking a dock item that has more than one window open performs no action at all — it does not focus, minimize, cycle windows, or show anything. The click is silently ignored, leaving no way to reach those windows from the dock.

This suggests the click handler for multi-window items is delegated entirely to the Applications Preview widget, with no fallback when it is unavailable. It may also explain the hover behavior above: if preview rendering is bound to the click path rather than to hover, single-window items would never trigger it.

To reproduce: disable the Applications Preview widget, open two windows of the same app, click its dock item — nothing happens.

Environment

Seelen UI v2.8.2 (msix, Microsoft Store) Windows 11 Dock/Taskbar and Applications Preview widgets enabled Window Manager disabled

https://github.com/user-attachments/assets/f2f939e0-0935-46b9-bee8-2468939e9de3 Seelen UI.log