'Ease Out' interpolation keyframes act as 'Ease In/Out'

[DanPinGF]

Describe the bug: For some reason, the 'Ease Out' Bezier interpolation keyframes act the same way as the 'Ease In/Out' keyframes, i.e., they have an 'attack' and 'release' time, when they shouldn't. The only possible workaround is to cut the clip at a point where it meets the keyframes, and then trim the cut clip after it eases in.

Steps to reproduce the behavior:

1. Import any video/image and drag it to the timeline.
2. Right-click on the video/image, then select 'Insert Keyframe' on any of the clip properties (e.g., Location Y, Scale X, etc.)
3. Set the property value to any number.
4. Right-click again on the property, go to 'Bezier', then select any of the 'Ease Out' interpolation options.
5. You can see that instead of just only easing out, it eases both in and out.

Expected behavior: When an 'Ease Out' interpolation mode is selected on a clip, I should not see the effect ease in first.

System Details:

• OpenShot Version: 3.1.1
• Operating System / Distro: Windows 11

Log Files: N/A

Exception / Stacktrace: N/A

Screenshots:

[robartsd]

I am seeing ease in behavior for all the ease out functions.