Braces in filenames prevent history entry creation when using `plain` backend
Files with braces in their name fail to get added to history, possibly only with the plain
backend, because braces are special characters in this format and do not get escaped when adding the entry.
The following error is printed when zathura is closed, after opening a file with braces in the name:
(org.pwmt.zathura:246459): GLib-CRITICAL **: 14:30:08.632: g_key_file_set_value: assertion 'group_name != NULL && g_key_file_is_group_name (group_name)' failed
Edited by Denis Kasak