Crash on master because of cursor position in session

[Scott Kostyshak]

To reproduce on current master:

1. Open the attached file.
2. Move cursor to just in front of the second comment inset.
3. Exit LyX.
4. Open the file again.

LyX has caught an exception, it will now attempt to save all unsaved documents and exit.

Exception: basic_string::substr: __pos (which is 44) > this->size() (which is 43)

Can anyone reproduce?

Scott
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