Do not erase a modified line when moving in the Python console history

[CyrilleB79]

Link to issue number:

Closes #16653

Summary of the issue:

Unexecuted commands are lost when moving in the python console history.

Description of user facing changes

If a command has been written or modified in the console but not executed, it will not be lost. In case the modified command is not the last in the history, the original history item will not be overriden (as it was before #15794), but it will be copied in last position in the history so that it can be edited.

Description of development approach

Tracked text modification with an appropriate event to react accordingly.

Testing strategy:

Manual tests.

Known issues with pull request:

As soon as you modify an item in the history, you lose your position in the history and turn back to last item.
Though it is preferred to avoid overwriting items in the history.

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

[CyrilleB79]

@cary-rowen, could you test this PR when the build is ready?

[cary-rowen]

Thanks @CyrilleB79
Yes, this works for me.