https://bugs.kde.org/show_bug.cgi?id=384797

            Bug ID: 384797
           Summary: UI Freezes 100% CPU usage of 1 core while clicking on
                    clip with spacer tool in large project
           Product: kdenlive
           Version: 17.08.1
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

In the current 17.08.1 version of Kdenlive I have a very large video project
lasting around 3 hours. Now I want to insert some clips to the front of it.

If I click on the spacer tool and then select a clip which is in the first
couple of minutes of the project with around >200 clips behind, the UI freezes
and uses 100% CPU of one core of my system. After a few _minutes_ the clip and
all the following clips are selected.

Dragging the clip with all its followers also takes minutes while the UI is
frozen and 100% CPU of one core is used.

I do not know what kdenlive is doing (calculating) that lasts this long, but
there is definitely a bug in it because it shouldn't last that long. I do not
know how I can add some clips between others in my project now because it
always freezes kdenlive once I select a clip with many followers in the
timeline.

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