it's very much hard-coded right now, becuase we are missing a few guidelines, and the topbar should appear progressively in transparency (probably leting pointer events pass-through until it reaches full opacity)

Try the following commit please :)

Created attachment 201556 [details] [review]
Show VM toolbar with a bit more delay or when reaching top

we may want to have that 20 pixels region only in window mode. Rationale:

- it's easy to reach top border / pixel 0 in fullscreen, and we don't want to annoy  users with the topbar when the pointer is near the top

- it's difficult to reach pixel 0 in window mode, but we don't want to show toolbar immediately either

The patch improves this a lot for easy operations, but it's still not ideal IMHO.

I'm not a fan of changing opacity based on pointer position, but ignoring that for a moment, I think a better behaviour for window mode would be making the area thinner (you would have to play with the exact size, but e.g. the shell panel is 25px so 20px sounds too much...maybe 5px?) and always move in the toolbar when it's reached.

I agree for fullscreen mode this doesn't make sense and the toolbar should always just move in when the top of the window is reached.

Attachment 201556 [details] pushed as 53bdd79 - Show VM toolbar with a bit more delay or when reaching top

we will revisit the topbar when adding opacity & animation support