Geotagged images dialog docked status not retained

[AM909]

In r3738 and likely later I see no patch for it):

Normally, with dockable windows (history, command stack, relations, etc.), if you close the window via one of the toggle toolbuttons on the left-side toolbar, when you open the window again with that button, the window comes back the same way: docked if it was docked when you closed it; undocked otherwise.

The geotagged images window (which displays each image) used to work this way too, but no longer does. It always comes back docked.