This one's pretty esoteric. I only have Qt 5.12.8 on my machine and
I have a feeling this is a bug in Qt that has probably been fixed. If
anyone has a later version of Qt than 5.12.8, can you give this test
case a whirl?
- Create a big segment. 8 bars or so.
- Open the matrix on that segment.
- Add 30 or so random notes so that you can see them all at once.
- Use the *toolbar* undo button (not the toolbar undo history drop down,
not Ctrl+Z and not the menu) to remove the notes one by one, paying
attention to whether they go away each time.
- Confirm that each note goes away each time the undo toolbar button is
pressed.
Michael Stockinger (our German translator) noticed that at least one
of the notes does not go away when doing this, and I've confirmed.
Note that you can manually refresh the screen by dragging a selection
rectangle over the area where the ghost note is and it will disappear.
Anyway, let me know if anyone can reproduce this with Qt versions
later than 5.12.8. Thanks.
Ted.
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