page1
This is my second text box.
7,2 cm
This is my first text box.
6,7 cm
Each of the text boxes is grouped with a measure line. Click on a text box and resize it. Notice, that the value of the measure line will follow. What do you expect, if you consolidate the text boxes?
Nothing to do in your patch. But it should be clear to the user, what your feature can not do.