Review Request: Speed up collapsing of all elements in Find/Replace treeview.

[Lambert CLARA]

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http://git.reviewboard.kde.org/r/102894/
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Review request for KDevelop.


Description
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Small patch that really speeds up the collapse all in find/replace treeview, it is not very pretty but it seems to work well, and whithout flicker.
Here are some bench I made :
* Search for "kate" in kdevplatform, not sensitive, 188 matches in 134 files :
  - Old method : 7657 ms to collapse all
  - New method : 38 ms

* Search for "model" in kdevplatform, not sensitive, 6475 matches in 336 files :
  - Old method : 56339 ms to collapse all
  - New method : 94 ms


Diffs
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  plugins/grepview/grepoutputview.cpp dc0a555 

Diff: http://git.reviewboard.kde.org/r/102894/diff/diff


Testing
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Search for all kind of stuff, try to expand/collapse all, search for non existing elements (in that case, the buttons are not sensitive).


Thanks,

Lambert CLARA

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