Ticket #4292: fix redundant back slashes for autocomplete.
Steps to reproduce:
1. Create file owth a space in the name:
touch "a b"
There should no other files with name begins with "a" in the directory.
2. Press Shift-F4 to open editor
3. Press Shift-F2 to display dialog window "Save as..."
4. Press Esc+Tab to fill an input line
Result:
a\ b will appear in the edit field.
If you attempt to save the file, the back slash will be in the filename.
Expected result:
no any extra back slashes in the file name.
Soution: escape only '?', '*', and '&' symbols as described in the
manual page (see
a11995e12b88285e044f644904c306ed6c342ad0).
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>