[rekonq] Review Request: Move Tab Preview to WebTab

[David Narváez]

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http://git.reviewboard.kde.org/r/104517/
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Review request for rekonq.


Description
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Let the WebTab class calculate its own preview, so that it can be used elsewhere in the code. Notice that it will return a null QPixmap in case the page is loading, which is currently the only case when we consider it invalid to produce a preview, but it can later be extended to whatever rule we want right at the WebTab class.


Diffs
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  src/tabpreviewpopup.cpp 4466868 
  src/webtab.h 92ae2eb 
  src/webtab.cpp 718d8b9 

Diff: http://git.reviewboard.kde.org/r/104517/diff/


Testing
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1. Load two or more tabs in Rekonq
2. Wait for them to load
3. Mouse over any tab and see the preview


Thanks,

David Narváez

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