Review Request 127632: Prioritize correct extension per theme

[Aleix Pol Gonzalez]

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https://git.reviewboard.kde.org/r/127632/
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Review request for KDE Frameworks and Christoph Feck.


Repository: kiconthemes


Description
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Usually themes will have 1 kind of extension (2 tops) it doesn't make sense to bindly use an extensions vector that is statically defined.

Prioritizes the extensions that work, so it will find the icons sooner.


Diffs
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  src/kiconloader.cpp 37528ad 
  src/kicontheme.h 3190665 
  src/kicontheme.cpp e7e003b 

Diff: https://git.reviewboard.kde.org/r/127632/diff/


Testing
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Builds and tests still pass.
Also reducess faulty disk accesses to its 45%. Note that by this metric, it's almost as good as the RR #127236, but with a much smaller memory impact, since we're not caching all the icon names (which was specially bad as it was per-process).
```
$ strace kwrite |& grep ENOENT | wc -l
4699
$ strace kwrite |& grep ENOENT | wc -l
2119
```


Thanks,

Aleix Pol Gonzalez

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