Review Request 129159: Major performance improvement when turning previews off in the file dialog.

[David Faure]

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https://git.reviewboard.kde.org/r/129159/
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Review request for KDE Frameworks.


Bugs: 346403
    https://bugs.kde.org/show_bug.cgi?id=346403


Repository: kio


Description
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Added a method for this KDirModel so it can emit dataChanged only once
(or once per dir in a tree) rather than for every item.

CCBUG: 346403


Diffs
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  src/filewidgets/kdiroperator.cpp 59b1141e3ffb8e95680e98ed29073a977d8d52a8 
  src/filewidgets/kfilepreviewgenerator.cpp 6937110aa53424f87575166109fa122452f9a817 
  src/widgets/kdirmodel.h 0cefcae6b3c6e14b0505683ff533bf25e7ccf583 
  src/widgets/kdirmodel.cpp 2e81d30990c0eb2af742fe1c811f991c0ad892e9 

Diff: https://git.reviewboard.kde.org/r/129159/diff/


Testing
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kdialog --getopenfilename /dir/with/many/images
Clicking on the file dialog's "preview" button to turn them off.
Before: 100% CPU for a minute or so
After: immediate response


Thanks,

David Faure

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