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Undo/redo should affect earmarks

Submitted by Yuri Khan @yurivkhan

Link to original bug (#766142)

Description

To reproduce:

  1. Set some earmarks in a cell.
  2. Click that cell and set it to a definite digit.
  3. Press Ctrl+Z.

Expected behavior: the cell returns to indefinite state with earmarks from step 1.

Observed behavior: the cell returns to indefinite state with earmarks lost.

Why this is a bug: accidentally missing Ctrl while pressing a digit key lead to loss of earmarks.

To reproduce:

  1. Set some cell to a definite digit.
  2. Set an earmark in another cell.
  3. Press Ctrl+Z.

Expected behavior: the last earmark from step 2 is removed; cell from step 1 not affected.

Observed behavior: the cell from step 1 returns to indefinite state; earmarks not affected.

Why this is a bug: earmarks are part of the solution process and should be tracked the same way as definite cells.

Version: 3.18.x