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[Launchpad Bug Tracker <1530277@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package compiz -
1:0.9.12.3+16.04.20171116-0ubuntu1

---------------
compiz (1:0.9.12.3+16.04.20171116-0ubuntu1) xenial; urgency=medium

  [ Eleni Maria Stea ]
  * Added option to disable blend in grid plugin (LP: #1700859)
  * Move: add options for showing only the window shape (filled or not)
    (LP: #1700859)

  [ Alberts Muktupāvels ]
  * Ensure that surfaces used by metacity theme have device scale set to
    1 . (LP: #1530277) (LP: #1530277)
  * Use AnyPropertyType when getting _MOTIF_WM_HINTS property. (LP:
    #1702297)

  [ Martin Wimpress ]
  * mate: Avoid artefacts of Windows Thumbnail Previews (LP: #1606369)

  [ Marco Trevisan (Treviño) ]
  * move: damage all the border area in outline mode and ignore
    transparent colors (LP: #1700859)
  * grid: ignore alpha in colors when not blending, and fix animations
    (LP: #1700859)
  * resize: add support for disabling transparency and avoid over-
    damaging in outline mode (LP: #1700859)
  * Screen: add averageColor to get the current desktop average color
  * unity-lowgfx.ini: remove unsupported unity option

 -- Marco Trevisan (Treviño) <mail@xxxxxxxxx>  Thu, 16 Nov 2017 23:00:54
+0000

** Changed in: compiz (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1530277

Title:
  gtk-window-decorator incorrectly draws the title bar if GDK_SCALE is
  set

Status in Compiz:
  Fix Committed
Status in Compiz xenial series:
  New
Status in compiz package in Ubuntu:
  Fix Released
Status in compiz source package in Xenial:
  Fix Released

Bug description:
  [Impact]

  I have a HiDPI screen. For all other GTK3 applications (and, to some
  extent, GTK2) to deal with it, I have to set two variables:

  GDK_SCALE=3
  GDK_DPI_SCALE=0.33333

  The font rendering DPI is set to 240.

  Unfortunately, this breaks decorations drawn by gtk-window-decorator,
  as illustrated on the screenshot. I can work around this by creating a
  wrapper that sets these variables to 1, only for this broken
  decorator.

  [Test case]

  1) In mate or pure compiz session run:
     env GDK_SCALE=3 GDK_DPI_SCALE=0.33333 gtk-window-decoration --replace
  2) Check the decorations appearance
  3) They should look properly scaled without glitches

  [Regression potential]
  The scaling is wrong or the decorations aren't properly painted

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