Issue Summary

When I try to create an "ordinary" animation, I cannot delete or ignore frames. If I fill sparse frames with drawings...

Actual Results

...all the frames are output in a GIF file: the animation plus pauses for all the frames that have no drawings.

Expected Results

I expect that if I skip some frames (so the gray rectangle is missing), these empty frames will be ignored when playing and in the output. Also, I expect that "delete frame" (either the - button or Menu > Animation > Remove Frame or Shift+F5) will delete the frame from the timeline, and move all later frames one frame earlier. Also, I expect that I can delete a range of frames indicated by the mouse. Also, I expect that Add Frame (F7) will add a frame at the current selected frame, not somewhere else.

Video or Image Reference

Steps to reproduce

Enter two key frame drawings, spaced apart by many frames. Fill in one inbetween frame in the middle, showing the middle drawing. Try deleting all the frames between the key frames and the middle frames, so that your animation contains only three frames: it cannot be done. The attached example is a scaled-up version of this description, with lots of unused frames. All these unused frames are actually output into the resulting GIF. Let me know if you need to see the GIF.

System Information

• Pencil2D Version: Version: 0.6.2
  Operating System: Windows 10 (10.0)
  CPU Architecture: i386

• Operating System:

• RAM Size:

• Graphics Tablet: