[Bugs] #4960 Sugar UNSP: Very Easy to Get Palette Highlight Damage

[Sugar Labs Bugs]

#4960: Very Easy to Get Palette Highlight Damage
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       Reporter:  SAMdroid                   |       Owner:
           Type:  defect                     |      Status:  new
       Priority:  Unspecified by Maintainer  |   Milestone:  Unspecified
      Component:  Sugar                      |     Version:  Unspecified
       Severity:  Unspecified                |    Keywords:
Distribution/OS:  Fedora                     |  Bug Status:  Unconfirmed
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 Steps to reproduce:

 1.  Mouse over "activity list" toolbar icon in homeview
 2.  Wait for the full palette to show
 3.  Move the mouse a little to the left, out of the toolbutton's area

 Expected result:
 Palette hides

 Actual result:
 The main part of the palette hides (the part that is the GtkWindow), but
 black-background/border around the toolbutton stays there.
 Triggering a redraw of the button (eg. clicking it to make it draw the
 checked state) removes that part of the palette.

 Tested on Gtk3.20.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4960>
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