If MOVIT is enabled clicking anywhere in the interface crashes kdenlive.



Reproducible: Always

Steps to Reproduce:
1. Open Kdenlive (with MOVIT enabled)
2. Click somewhere in the interface
3. Crash



(gdb) run
Starting program: /usr/bin/kdenlive 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffdc6c6700 (LWP 6485)]
[New Thread 0x7fffcf33c700 (LWP 6486)]
[New Thread 0x7fffa9c88700 (LWP 6487)]
[New Thread 0x7fffa61e6700 (LWP 6488)]
[New Thread 0x7fffa51e5700 (LWP 6489)]
[New Thread 0x7fffa49e4700 (LWP 6490)]
Removing cache at "/home/farid/.cache/kdenlive-thumbs.kcache"
[New Thread 0x7fff92e65700 (LWP 6491)]
[Thread 0x7fff92e65700 (LWP 6491) exited]
[New Thread 0x7fff92e65700 (LWP 6492)]
[New Thread 0x7fff966e4700 (LWP 6493)]
OpenGL vendor:  "NVIDIA Corporation"
OpenGL renderer:  "GeForce GTX 660 Ti/PCIe/SSE2"
OpenGL ARG_SYNC:  true
OpenGL OpenGLES:  false
[New Thread 0x7fff95ee3700 (LWP 6494)]
[New Thread 0x7fff956e2700 (LWP 6495)]
[New Thread 0x7fff94ce1700 (LWP 6496)]
OpenGL vendor:  "NVIDIA Corporation"
OpenGL renderer:  "GeForce GTX 660 Ti/PCIe/SSE2"
OpenGL ARG_SYNC:  true
OpenGL OpenGLES:  false
[New Thread 0x7fff73ffd700 (LWP 6497)]
[New Thread 0x7fff733fc700 (LWP 6498)]


(gdb) backtrace
#0  0x00007fffefb42295 in raise () from /usr/lib/libc.so.6
#1  0x00007fffefb436da in abort () from /usr/lib/libc.so.6
#2  0x00007fffb81f6ac3 in GlslManager::render_frame_texture(movit::EffectChain*, mlt_frame_s*, int, int, unsigned char**) () from /usr/lib/mlt/libmltopengl.so
#3  0x00007fffb81f9a02 in ?? () from /usr/lib/mlt/libmltopengl.so
#4  0x00007ffff6d86058 in mlt_frame_get_image () from /usr/lib/libmlt.so.6
#5  0x00007ffff6d9bf89 in ?? () from /usr/lib/libmlt.so.6
#6  0x00007ffff6d86007 in mlt_frame_get_image () from /usr/lib/libmlt.so.6
#7  0x00007ffff6d99734 in ?? () from /usr/lib/libmlt.so.6
#8  0x0000000000702a9d in ?? ()
#9  0x00007ffff05e6b38 in ?? () from /usr/lib/libQt5Core.so.5
#10 0x00007fffee0b4484 in start_thread () from /usr/lib/libpthread.so.0
#11 0x00007fffefbf66dd in clone () from /usr/lib/libc.so.6
(gdb) quit