Review Request 129011: spend some love on Kdenlive's library: fix resource paths on playlist expansion, improve user interaction and error reporting

[The DiveO]

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https://git.reviewboard.kde.org/r/129011/
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Review request for Kdenlive.


Repository: kdenlive


Description
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This patch gives a little love to Kdenlive's library:
- replaces the ambigious "+" icon to add a library clip to your project with the "add clip" icon, thus getting in line of adding a clip to the project bin.
- improves on error reporting during playlist expansion: errors are now clearly reported to the user through the status bar reporting mechanism; most users won't have a terminal window visible while using Kdenlive, so they won't see the error debug messages.
- fixes Kdenlive hanging for a very loooooooong time while trying to load producers after playlist expansion due to relative paths failing. This patch checks for relative producer urls during expansion and properly re-roots them based on the playlist's root element/directory. Of course, this does not fix issues where clips have been moved after a library playlist clip has been created.


Diffs
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  src/bin/bin.cpp 00d9587 
  src/library/librarywidget.cpp 7620bbe 
  src/mainwindow.cpp 8022226 
  src/timeline/customtrackview.cpp 3462496 

Diff: https://git.reviewboard.kde.org/r/129011/diff/


Testing
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Tested on recent Kdenlive git master.


Thanks,

The DiveO

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