When chromium creates a notification window it gets raised

[AlanGriffiths]

This is when using Miriway 24.11, and there are several parts:

1. Chromium creates a notification window (why doesn't it use swayync?);
2. this window gets raised (how? xdg-activation?); and,
3. Miriway responds to the raise by (potentially) switching workspaces.

I am not sure if this is Mir, or Miriway at fault as I've not traced how the raise request is validated. But Chromium shouldn't be able to use xdg-activation when it doesn't have focus.

To reproduce (in Miriway):

When chromium is about to pop up a notification, switch to any other workspace.

Expect: focus to remain on the active window in the current workspace
Actual: focus moves to Chromium in its workspace