Segfault in Kdenlive when adding crossfade on audio channel.
Hi there! Kdenlive crashes quite reliably with the kdenlive project below, when adding in crossfades on the audio. [Crash_Test.kdenlive](/uploads/90e08276ed07be6cd23db3dea7330a29/Crash_Test.kdenlive) Here is the GDB backtrace: [2023-08-30_Kdenlive-Crash.txt](/uploads/902a3661028b2aa77d9f7254e8655ae4/2023-08-30_Kdenlive-Crash.txt) And lastly, a video of how to induce the crash: ![2023-08-30_15-43-36](/uploads/d8d5844763b702247beed0090c14b8cb/2023-08-30_15-43-36.mp4)
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