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Created attachment 1197622 [details]
backtrace

Description of problem:
When opening the attached TXT file with .rst extension gedit crashes

Version-Release number of selected component (if applicable):
gedit-3.14.3-18.el7.x86_64

How reproducible:
2 out of 2 attempts

Steps to Reproduce:
1.gedit PROJECTION\ TODO\ CHECKLIST.rst
2.
3.

Actual results:
crash

Expected results:
no crash, file opened

Additional info:

Created attachment 1197623 [details]
reproducer document

Still happens with gedit-3.28.1-1.el7.x86_64

did a quick search. seems like the fix is upstream here:

https://gitlab.gnome.org/GNOME/gtksourceview/commit/06a9d3751c808870dc72e470700693d01f4fc284

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (GNOME bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3987