[bug] b14 prv 31: Multiple Undo leads to mixed up text

Release b14 prv31 fixes issues with multiple Undo and some erros are gone. This 
is very good.

But still I find the multiple Undo functionality very unstable. Sometimes parts 
of the text are deleted or lines become mixed up.
This bug is difficult to reproduce. However this is what I do:

1. Run FTC
2. Insert some words in the middle of each line of the first paragraph. Change 
position in the text with the mouse.
3. Go back to the first line and second line and insert some more text.
4. Select some text with the mouse and delete it.
5. Press ctrl-z to undo your editing and keep it pressed until all steps are 
undone.
5. Bug: Very often you will find that you cannot restore the text and parts of 
the text are deleted or mixed up.

We should try to find steps to reproduce this issue for Brendon or skip the 
Undo functionality.

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