Any window with a non-1.0 (less than 0xff) alpha or X channel gets discoloured
when alt+tabbing:
mir_demo_client_egltriangle -b 0.2 -- --desktop_file_hint=unity8
And you have to keep in mind that the 'X' byte might be uninitialized, so
another good test case is:
Xmir :0 -rootless -flatten -sw --desktop_file_hint=unity8
env DISPLAY=:0 gedit
and then Alt+Tab.
Observed: Parts of the window in the switcher are discoloured/whiter. This is
Unity8 treating the uninitialized X byte as an alpha byte. Although even RGBA
windows get discoloured with low values of A.
Observed: In the background the fullscreen blur is also faulty -- it's clearer
and not blurred in the same regions as are affected by the first issue.
** Changed in: qtmir
Status: Incomplete => New
** Changed in: qtmir (Ubuntu)
Status: Incomplete => New
** Changed in: unity8 (Ubuntu)
Status: Invalid => New
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https://bugs.launchpad.net/bugs/1510386
Title:
RGBX windows become discoloured (more white or translucent) and
corrupt in the Unity8 window switcher
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