Review Request 126630: Do not unconditionally enable logging

[Peter Wu]

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https://git.reviewboard.kde.org/r/126630/
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Review request for Plasma, Solid, Daniel Vrátil, and Sebastian Kügler.


Repository: libkscreen


Description
-------

Logging is [enabled by default][1], there is no read to use setFilterRules
and [override][2] any user preferences in QtProject/qtlogging.ini.

 [1]: https://doc.qt.io/qt-5/qloggingcategory.html#Q_LOGGING_CATEGORY
 [2]: https://doc.qt.io/qt-5/qloggingcategory.html#configuring-categories


Diffs
-----

  backends/fake/fake.cpp 94586bc 
  backends/kwayland/waylandbackend.cpp 0700e22 
  backends/qscreen/qscreenbackend.cpp 56b5a7c 
  backends/xcbeventlistener.cpp ee415d7 
  backends/xrandr/xrandr.cpp fae1dcc 
  backends/xrandr1.1/xrandr11.cpp 631bcc9 
  src/debug_p.cpp 5934417 

Diff: https://git.reviewboard.kde.org/r/126630/diff/


Testing
-------

Tested on v5.5.2 (cherry-picked, ignored missing backends/kwayland/waylandbackend.cpp).

Test:

 1. Have no kscreen related lines in ~/.config/QtProject/qtlogging.ini
 2. killall kscreen_backend_launcher
 3. Change brightness levels via the keyboard. (Result: `RRNotify_OutputProperty` messages in `journalctl`)
 4. Add the following lines to qtlogging.ini:
```
kscreen.debug=false
kscreen.xrandr.debug=false
kscreen.xcb.helper.debug=false
```
 5. killall kscreen_backend_launcher
 6. Change brightness levels again. (Result: no log spam!)


Thanks,

Peter Wu

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