D20204: Fix always full rect blur mask for panels ignoring shape from Plasma themes

[Friedrich W. H. Kossebau]

kossebau created this revision.
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REVISION SUMMARY
  Plasma themes might define non-full-rect shapes for panels (e.g. round
  borders for panels not filling the whole width/height).
  The old code tells the window manager to blur the full rect of a panel
  window, resulting in unwanted artifacts around the panel shape for
  non-full-rect themed panels.
  With the Panel.qml item of the desktop packages exposing some optional
  "panelMask" property now, we can query for the shape and only use the
  painted area when telling the window manager where to blur behind or
  changing the background contrast.
  This also follows the logic as already applied for dialogs or other window
  elements like tooltips which are rendered using a Plasma theme.

TEST PLAN
  The Oxygen Plasma theme no longer has blurry corners on panel edges.
  Also still works as before when using non-composing window manager.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  getpanelmaskfrompanel

REVISION DETAIL
  https://phabricator.kde.org/D20204

AFFECTED FILES
  shell/panelview.cpp

To: kossebau, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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