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SUMMARY
Dear Devs,
I've discovered an unseen bug. If you import 2 clips and you haven't a countinuos audio/video track (i.e. you have a 2 video/audio files splitted and nothing between those) you cannot export the video as is in the timeline, but you will export it until the first split. I've resolved adding a mute audio track between the split, but I think that you could solve it as default.

Thanks in advance for listening,
Best Regards
Lorenzo DM

STEPS TO REPRODUCE
1. add 2 clip to the timeline with 1 minute of nothing from the end of the 1st and the begin of the 2nd
2. try to export
3. you will have only the first video exported

OBSERVED RESULT
Only one video exported on 2 added to the timeline

EXPECTED RESULT
the 2 video exported with a pause in between

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION