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When I edit a graphical element (here: rectangle), insert the cursor and hit any character key or space bar, the box turns black from top left corner until the last character or space of the bottom right.
Editing of the box is only possible by accepting to “fly” (=type) fully blind.
The text box color goes back to normal color either by clicking outside the box or hitting the esc key.
top : box appearance when cursor in the box or outside; when inside no character key made he hit.
bottom: box appearance when cursor in the box AND at least one character key or space bar is hit.