Review Request 129023: more Kdenlive library love: improve playlist expansion

[The DiveO]

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https://git.reviewboard.kde.org/r/129023/
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Review request for Kdenlive.


Repository: kdenlive


Description
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This patch improves the existing expansion of playlist clips in the timeline as follows:
- improves on error reporting when there is not enough free track space to expand the clip, more precisly spelling out what amount of free track space is needed, as opposed to free tracks.
- improves overall error reporting in the context of expanding playlist clips by adding user-visible reporting where we only had debug messages so far.
- improves on collision detection, improving workflow for some Kdenlive library users, see below.
- playlist clip expansion is no **down** instead of *up*: this better matches the overall timeline concept, where in the timeline transitions belong to the "b track" upper track, as opposed to the "a track". Transitions extend **below** the track they are placed on.
- if there isn't enough free room on the timeline *below*, then, as before, the playlist clip is attempted to be shifted up for expansion in order to find enough free track space.
- following the timeline model, expand clip does not regard a transition immediately above the playlist to be a collision. In fact, as playlist clips cannot possess transitions with a "b track" above their topmost playlist track, there can't be such a collision anyway. In turn, this patch improves the workflow for those users that have things like overlay logos on a top track and need to expand a playlist clip immediately below it.


Diffs
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  src/timeline/customtrackview.cpp 4ba92d9 

Diff: https://git.reviewboard.kde.org/r/129023/diff/


Testing
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On recent Kdenlive git master.


Thanks,

The DiveO

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