Time stretch lost when exiting cut point editor

[mythtv@…]

This one is a little obscure, so hopefully it can be duplicated. I recently upgraded to 0.24-fixes r27076 (I don't see any related changes in the subsequent check-ins). This worked properly in 0.23-fixes.

I have a recording that is assigned a custom playback group with a time stretch of 1.3x. When you start playing the recording, it plays at 1.3x speed. If you then jump into cut mode (press E), then exit cut mode, the time stretch is reset to 1. Not only is the value reset, the TOGGLESTRETCH toggle key won't actually toggle back to the previous time stretch value. If you open the menu, then go to Playback > Adjust Time Stretch > 1.3x, it will correctly apply the stretch again. However, if you immediately go into cut mode again, the problem will resurface.

However, if you start the video, then press the TOGGLESTRETCH toggle key BEFORE you go into cut mode, you can then safely go into cut mode and the TOGGLESTRETCH toggle key will continue to work after you exit. It will still reset the time stretch upon exit.

It doesn't seem to exhibit this behavior if you are using the default playback group (perhaps because it starts with no time stretch applied?).

To sum up the steps where it fails:

1. Start video using playback group with 1.3x time stretch
2. Enter cut mode (E)
3. Exit cut mode. Time stretch resets and TOGGLESTRETCH will not work
4. Open the menu > Playback > Adjust Time Stretch > 1.3x
5. Enter cut mode (E)
6. Exit cut mode. Time stretch resets and TOGGLESTRETCH will not work

If you press the TOGGLESTRETCH key BEFORE entering cut mode (step 2 or 5), it will continue to work after exiting cut mode.

[markk]

(In [27117]) Preserve the time stretch value when entering/exiting edit mode.

Closes #9179