D17459: SearchBar: Add Cancel button to stop long running tasks

[loh tar]

loh.tar created this revision.
loh.tar added reviewers: KTextEditor, VDG.
Herald added projects: Kate, Frameworks.
Herald added subscribers: kde-frameworks-devel, kwrite-devel.
loh.tar requested review of this revision.

REVISION SUMMARY
  Without this patch could it happens that Kate run an almost endless S&R
  job which could lead up to an unusable system due to a run out of memory
  with no possibility to cancel the job other than kill Kate, See...
  
        
  
  CCBUG: 333517

TEST PLAN
  Before
  F6466371: 1544349999.png <https://phabricator.kde.org/F6466371>
  
  New waiting for action
  F6466378: 1544380395.png <https://phabricator.kde.org/F6466378>
  
  New while running job
  F6466380: 1544381064.png <https://phabricator.kde.org/F6466380>

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D17459

AFFECTED FILES
  src/search/katesearchbar.cpp
  src/search/katesearchbar.h
  src/search/searchbarpower.ui

To: loh.tar, #ktexteditor, #vdg
Cc: kwrite-devel, kde-frameworks-devel, #ktexteditor, hase, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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