Created attachment 62698 [details]
Bug in slide thumbnail overlay positioning

The slide thumbnail overlay that allows us to start the presentation, disable a slide or duplicate it, is getting in the user's way! This can be seen in the attached file.
The overlay gets activated when the mouse cursor is hovering over a thumbnail. The (buggy) position of the overlay seems to depend on the "point of entrance" onto the thumbnail. Dragging the mouse cursor over a thumbnail from the top makes the overlay appear at its bottom. But the "point of entry" doesn't say anything about where the user stops moving the mouse! If the mouse cursor enters from top but stops at the bottom, then the overlay will appear under the mouse cursor. If the user then clicks on the thumbnail to activate/edit the slide, he clicks on the overlay instead and performs an action that he didn't intend to perform (like disabling the slide).

This is another fine example of an automatism that is supposed to help but instead results in unexpected behaviour.

Firstly, the overlay should be optional and the user should be able to disable it! That could be achieved by providing a "disable overlay" option in a "right click context menu" for the overlay and an additional entry in the options window.
Secondly, the position of the overlay should depend on the position of the mouse cursor! Display of the overlay should be triggered by dragging the mouse cursor over a slide thumbnail, but the position of the overlay should depend on the position of the mouse cursor at the time when the overlay is appearing!