It would be good to have a popup menu check box to wrap lines.

There is a 
[wrap](https://docs.gtk.org/gtk3/property.CellRendererText.wrap-mode.html) 
property to render treeview lines, but I can't get that to work. Here's my 
branch:
https://github.com/ntrel/geany/commits/msgwin-wrap/

Even if you call `g_object_set` when the cell renderer is created, it still 
doesn't work because of a GTK bug:
https://stackoverflow.com/questions/17597043/gtk-cellrenderertext-makes-itself-really-tall-when-i-wrap-it

It was closed as won't fix:
https://gitlab.gnome.org/GNOME/gtk/-/issues/12

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