D16188: Prevent QWebEngine from overriding signal handlers

[Christoph Roick]

croick created this revision.
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REVISION SUMMARY
  - The documentation view may use QWebEngine, which is based on Chromium, which installs its own signals handlers. This breaks the use of KCrash.
  - Overriding the signal handlers can be prevented by setting an environment variable before the use, just like in D16004 <https://phabricator.kde.org/D16004>.

TEST PLAN
  - open a documentation page in KDevelop
  - kill SIGABRT KDevelop -> DrKonqi shows up

REPOSITORY
  R32 KDevelop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16188

AFFECTED FILES
  kdevplatform/documentation/standarddocumentationview.cpp

To: croick, #kdevelop
Cc: kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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