Keyframes system fixing and improvements

During the last test of use I took note of the following issues and possible improvements for the Keyframe system in the Effect Stack widget:

Issues to fix:

• Copy keyframes and alpha values: I copied keyframes from the Transform compositor to the Transform effect on the same clip to replace one with the other but the opacity values were always ignored and set to 100.

• Copy keyframes and navigation creates issues. I don’t know if this depends on the position of the cursor during the copy and paste of the keyframes. It happened that after the copy when I seek for the last keyframe by using the navigation button, the cursor jumped forward to the end or the beginning of another clip on the same track in the timeline. I think there is some issue in the offset but I’ve to investigate more.

Suggested Improvements:

• Allow resetting all the values of one single frame in one click.

• Remove the fixed keyframe on the first frame: you don’t always need a keyframe on the first frame of the clip. Generally, you create it where you begin the animation and all the previous frames take the value of this first keyframe. This is useful because if you set the time region where you want to work by placing a clip and you begin your animation in a specific moment which doesn’t correspond with the 1st frame of the clip (and this is a very common situation) you’ll have to copy back the value you set on the first frame of the clip manually and other side effects. This makes the use of the keyframes a little more tricky.

• Allow the copy of all the values of a single keyframe to another one by one click (right-click on the source keyframe to copy and right-click on the destination keyframe to paste), the interface we have allows it but it’s not very intuitive and it asks for a setting passage and it’s not always successful.

• Add speed-up/slow-down interpolation and/or more shapes #572 (closed)

• (add by ME) copy/paste specific keyframes to playhead position #669 (closed).