Bug 433623

STEPS TO REPRODUCE
- Have a video in the Project Bin
- Have two different zones of it
- Have those zones in the timeline
- Extract audio for both zones
--> Audio clips are shown in the Project Bin with different durations
--> Check the location where the audio files have been created on disk and make a note of the date/time and size
- Extract audio of zone 1 again

OBSERVED RESULT
- Project Bin shows three audio clips all having the duration of zone 1
- Overwrites wav file from zone 2 without a warning. If you have made any changes to that file, those will be lost.


EXPECTED RESULT
kdenlive should show a warning when the file being exported to already exists that also states that changes will be lost.

SOFTWARE/OS VERSIONS
Windows 10

ADDITIONAL INFORMATION
I rated this bug critical as it isn't easily noticeable and can lead to a lot of data loss (as I learned the hard way). I edited some minutes of wave files to correct audio problems and only noticed this problem after some hours of work (as the correction had to be done manually for quite some positions).