https://bugs.kde.org/show_bug.cgi?id=367693

            Bug ID: 367693
           Summary: git master - Preview render problem: isn't always
                    rendering timeline properly (video example included)
           Product: kdenlive
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: jesse.dub...@gmail.com

See video link in URL field for details.

Sometimes, when a preview-render has finished for zones in the timeline, making
changes within those zones and preview-rendering again doesn't always show
updated changes; instead, it reverts back to the cached data (I believe).
Deleting the cached data will force it to re-render the zones, which it then
works fine.

Reproducible: Always

Steps to Reproduce:
1. Create a new project
2. Add some clips to the timeline, add fx/transitions/titles/whatever
3. Set a preview render zone and start preview render
4. When preview render is done, make changes to clips in that preview render
zone and start preview render again.

Actual Results:  
Preview render finishes almost immediately, but uses the already rendered cache
data for the timeline and doesn't seem to re-render the areas that have had
changes to them since last preview render.

Expected Results:  
Starting preview render will always re-render areas/zones that have had changes
to them since last preview-render.

Bug discovered while using Kdenlive 16.11.70 git master build via
ppa:kdenlive/kdenlive-master.

Ubuntu 16.04 x64, Unity 7.4.0 desktop environment.

KDE Frameworks 5.18.0.
Qt 5.5.1

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