In multiple places we have the problem that when an undo command
is executed, the corresponding value-changed signals are emitted,
which in turn updates the UI. This can have nasty UI effects, such
as the cursor position in the notes field being reset.
To avoid this, add a flag that indicates whether a newly placed
command is currently executed.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
1b8f3a06ec