Review Request 128944: Reduce temporary allocations in the DesktopFileParser

[Aleix Pol Gonzalez]

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https://git.reviewboard.kde.org/r/128944/
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Review request for KDE Frameworks.


Repository: kcoreaddons


Description
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While analising plasmashell under heaptrack, one of the sore spots is temporary allocations within DesktopFileParser. This improves the situation by:

* Only converting to QString/utf8 once.
* Using QStringRef instead of fully splitting QString to parse them.


Diffs
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  src/lib/plugin/desktopfileparser.cpp 2eb198d 
  src/lib/plugin/desktopfileparser_p.h c61b297 

Diff: https://git.reviewboard.kde.org/r/128944/diff/


Testing
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tests still pass, plasma still works normally.

heaptrack plasmashell:

after:
        allocations:            4169312
        leaked allocations:     83225
        temporary allocations:  606902

before:
        allocations:            4680691
        leaked allocations:     84825
        temporary allocations:  819292


Thanks,

Aleix Pol Gonzalez

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