Update to 2.2.3
    
    - New upstream release 2.2.3 (many minor bugfixes and many minor enhancements)
      - Fix segfault in syntax scanner
      - Code folding has major fixes and improvements
      - Search has major fixes
      - Lorem ipsum generator added
      - GUI restructured in some areas
      - Some shortcut key combinations added
      - Visibility features such as bigger cursor and cursor highlighting added,
        and some options were improved such as zoom and custom colors
      - Changes to external commands include better cursor positioning after a
        filter has been used, user-supplied arguments, and an option to restore
        the default settings
      - Some dialogs added for HTML5
      - Thumbnail generator fixed
      - Insert color, path and relative path have been added
      - Many language files improved, and more user configurable options added to
        most language files
      - You can now select a block of text by dragging the mouse in the margin, and
        move the selected block with <ctrl><up> and <ctrl><down>
    - Drop workaround for broken gucharmap pkgconfig file (#795537)
    - Fix missing trailing semicolon in Spanish translation of desktop file
      (Gnome Bug #678951)
    - Bump gtk2 requirement to 2.18 (F-12 and above) (Gnome Bug #678953)