This is a follow-up to bug 1820168.

Steps to reproduce:

1. Load the attached testcase.
2. Right-click over the yellow area.
3. Left-click over the yellow area outside of the menu.

Expected results:
Once the menu closes, the mouse cursor should disappear again.

Actual results:
The mouse cursor remains visible until you mouse out and back into the yellow area.

Furthermore, the following should still work after this is fixed:

Steps to reproduce:

1. Load the attached testcase.
2. Drag and drop the green box slightly to the right, while remaining in the green or yellow area.
3. Drag and drop it again (don't move out of the green/yellow area.)
4. And again.
5. Move the mouse out of the green/yellow area.

Expected results:
The mouse cursor should be come visible.

My initial attempt to fix the former caused the latter to break, because the hide/unhide calls became unbalanced.

The severity field is not set for this bug.
:spohl, could you have a look please?

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