[Differential] [Request, 100 lines] D3964: Fade out OnScreenNotification when moving with the mouse over it

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma on Wayland.
Restricted Application added subscribers: kwin, plasma-devel.
Restricted Application added projects: Plasma on Wayland, KWin.

REVISION SUMMARY
  This change triggers a fade out animation when the mouse is moved over
  the OnScreenNotification, thus revealing the windows underneath. When
  moving the mouse out of the OnScreenNotification it gets faded in again.
  
  This is useful for various cases, e.g. when picking a color and the pixel
  one wants to pick is underneath the notification, or when trying to kill
  a window...

TEST PLAN
  Manual testing in nested setup

BRANCH
  osn-fade-out

REVISION DETAIL
  https://phabricator.kde.org/D3964

AFFECTED FILES
  autotests/CMakeLists.txt
  autotests/onscreennotificationtest.cpp
  onscreennotification.cpp
  onscreennotification.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma_on_wayland
Cc: plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, eliasp, sebas
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