Error with folded multiline code cells

[AsamMich]

This is an old bug which was reported already in issue #1674. As this bug is still present in version 23.02.0 and I cannot reopen the issue, I create here a new one.

If a cell contains more than one line of code and its view is collapsed, so that just the first line is visible (hide-mode), the execution produces an error.

Steps to reproduce:

• Enter in the first cell the following code which goes over 4 lines:

  m : matrix(
  [1, 2],
  [3, 4],
  [5, 6]) $

• Enter in the second cell m;
• Collapse the first cell, so that only the first line of the cell is visible (hide-mode)
• Press the button "Send all cells to maxima"

Then the following error occurs:

Please note, that there is also an additional semicolon added at the end in the first cell. Although this doesn't hurt, it shouldn't be there.