Review Request 127236: Leverage QDir to know what's in a KIconThemeDir

[Aleix Pol Gonzalez]

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https://git.reviewboard.kde.org/r/127236/
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Review request for KDE Frameworks and Christoph Feck.


Repository: kiconthemes


Description
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At the moment we're playing Battleship to see if an icon is present in a subdirectory. This means that we are checking on every directory if there's an icon that matches the size with a said name on every request.

This can be seen easily with strace:
```
$ strace kwrite |& grep ENOENT | wc -l
6212
```
After the patch: 
```
$ strace kwrite |& grep ENOENT | wc -l
1993
```
We reduce these accesses to let QDir keep the list of files inside the directory (that was already being generated at some point, it just was being discarded).


Diffs
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  src/kicontheme.cpp 0996054 

Diff: https://git.reviewboard.kde.org/r/127236/diff/


Testing
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Builds, tests still pass, applications start noticeably faster.


Thanks,

Aleix Pol Gonzalez

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