Good morning.
Your program have one problem.
If I want icon drag/shape from left then I can't edit now text inside shape.
I can edit text inside only if I unselect and hold click.
If I select shape through click icon and click workspace working, runs properly.
This is note for autors Dia program, because for me it is not a problem but if you don't saw this error may this note is need.
I greet
