[gedit] docs: add common-bugs.md page

[Sébastien Wilmet <swilmet src gnome org>]

commit a0df81e009af5cad9d9edae0b67dd5eb2c6ccf68
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Apr 6 16:38:19 2020 +0200

    docs: add common-bugs.md page
    
    Inspired by the Fedora common bugs pages.
    
    And taking some of the content from:
    https://wiki.gnome.org/Apps/Gedit/ReportingBugs

 docs/common-bugs.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
---
diff --git a/docs/common-bugs.md b/docs/common-bugs.md
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+Common gedit bugs
+=================
+
+This page documents common bugs in gedit. If you find your problem in this page,
+_please do not report a new bug for it_.
+
+Problem with very long lines
+----------------------------
+
+Very long lines (e.g. a wrapped line that takes the whole screen) are not well
+supported by gedit, there can be performance problems or freezes.
+
+[GitLab issue](https://gitlab.gnome.org/GNOME/gtk/issues/229). See also the
+[gedit FAQ](https://wiki.gnome.org/Apps/Gedit/FAQ).
+
+Windows and macOS support
+-------------------------
+
+The latest binaries of gedit available for Windows and macOS may not work
+correctly on a recent version of these operating systems.
+
+There is work in progress to have a more recent gedit version available on
+Windows.