Review Request 127437: Fix many threading issues in KUrlCompletion

[David Faure]

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https://git.reviewboard.kde.org/r/127437/
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Review request for KDE Frameworks.


Repository: kio


Description
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* Major race with other threads due to using QDir::setCurrent()
* Race conditions on m_terminationRequested and m_matches
* Race with previous completion thread when its posted event arrives after cancelling
* Cancellation code spread out in many methods and never done fully correctly
* isRunning() was missing one of the two threads, making unit test fail in valgrind
* Fix the rarely-hit code path where the thread isn't finished after 200ms
   - the current search string was lost because finished() wasn't called
   - the matches were not used, in case of user-completion (AFAICS)
   - changing the search string while the thread was running could lead to the old search
     string still being used for completion
     (the misnamed finished() wasn't called, so KCompletion didn't get the new string)
  => added a variant of the unittest which doesn't wait for the thread initially

+ Simplify code using signal/slots rather than a custom event
+ Simplify code using enum rather than casting to/from int

Most of these bugs are from 2004 (e.g. commit ec83c408619e3) ;)

REVIEW: 127436


Diffs
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  autotests/CMakeLists.txt 4dff0a24d31897a9641a70017bd87e33415cef14 
  autotests/kurlcompletiontest.cpp eef39ff17940fadcb9492e5e7092070c976310d4 
  src/widgets/CMakeLists.txt 87dac50b377f6ea4c3cd39e9afa37a4680aecf31 
  src/widgets/kurlcompletion.h 14fda22a0e08bcf2da30e19fed577c8bda64a4ca 
  src/widgets/kurlcompletion.cpp 1dc8f4898fb78d6f49e687462446007a10305f98 

Diff: https://git.reviewboard.kde.org/r/127437/diff/


Testing
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Hit a crash in DirectoryListThread when playing with kopenwithtest.

kurlcompletiontest extended, kurlcompletion-nowait added, both pass, also in valgrind (different timings).


Thanks,

David Faure

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