Improve navigation in video editor when zoom is active
When the user uses the zoom functionality of the video editor, things get somewhat unintuitive.
The users clicks into the waveform at some specific time. While the user might expect that a) the playback position of the video is set to that time and b) the playhead will be moved to that position just clicked, Opencast does not fulfill the user expectation b).
Instead of b), the video editor repositions the waveform graphics so that the new playhead position if proportional to the full video length.
The goal of this task is to make the navigation within the video more intuitive.