[regression] disable/enable clip broken in 19.04.2c (works in 19.04.2a)
Somewhere between kdenlive 19.04.02a and 19.04.02c (tested with Linux AppImages and compiled source rev. 1ccccbbf), disable/enable clips stopped working. Upon disabling a clip, it will appear gray in the timeline, but will continue to play in the project monitor as though it were enabled. If you load an existing project containing a disabled clip, enabling that clip will cause the clip in the timeline to turn from gray to colored, but it will not play in the project monitor. Furthermore, changes to clip disable/enable do not appear to be saved in the project file, so saving and re-opening the project is not a workaround for this bug.