[Merge] lp:~sil2100/kubuntu-packaging/qtbase-opensource-src_5.0.2_qapp_fix into lp:~kubuntu-packagers/kubuntu-packaging/qtbase-opensource-src_5.0.2

[Łukasz Zemczak]

Łukasz Zemczak has proposed merging lp:~sil2100/kubuntu-packaging/qtbase-opensource-src_5.0.2_qapp_fix into lp:~kubuntu-packagers/kubuntu-packaging/qtbase-opensource-src_5.0.2.

Commit message:
Fix a segmentation fault bug in a strange case when a QWidget element (for instance, a QMenu element) gets freed (destroyed) after the main application exits and QApplication objects stops existing. Do not assume qApp will be present when cleaning memory. Fixes #1273306.

Requested reviews:
  Kubuntu Packagers (kubuntu-packagers)
Related bugs:
  Bug #1273306 in appmenu-qt (Ubuntu): "python3.3 crashed with SIGSEGV in QWidget::destroy()"
  https://bugs.launchpad.net/ubuntu/+source/appmenu-qt/+bug/1273306

For more details, see:
https://code.launchpad.net/~sil2100/kubuntu-packaging/qtbase-opensource-src_5.0.2_qapp_fix/+merge/204471

Fix a segmentation fault bug in a strange case when a QWidget element (for instance, a QMenu element) gets freed (destroyed) after the main application exits and QApplication objects stops existing. Do not assume qApp will be present when cleaning memory.
-- 
https://code.launchpad.net/~sil2100/kubuntu-packaging/qtbase-opensource-src_5.0.2_qapp_fix/+merge/204471
Your team Kubuntu Packagers is requested to review the proposed merge of lp:~sil2100/kubuntu-packaging/qtbase-opensource-src_5.0.2_qapp_fix into lp:~kubuntu-packagers/kubuntu-packaging/qtbase-opensource-src_5.0.2.
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