mkvmerge & mkvextract: added support for HDMV TextST subtitles.
mkvextract: VobSub bug fix: mkvextract will add a "langidx" line to the .idx file upon extraction. Fixes #1810.
MKVToolNix GUI: multiplexer enhancement: added a column "source file's directory" to the track list. Implements #1809.
MKVToolNix GUI: multiplexer enhancement: added an option for selecting all tracks of the currently selected source files in the source file context menu. Inspired by #1809.
MKVToolNix GUI: job output tool bug fix: the button for acknowledging warnings & errors wasn't properly disabled when the user used outside methods of acknowledging them (e.g. via the menu or via the job queue). Fixes #1802.
mkvmerge: MPLS parser bug fix: fixed reading the "in" & "out" timestamps for "play items". This bug resulted in mkvmerge not reading the correct range from the referenced M2TS file under certain rare circumstances.
mkvmerge: bug fix: mkvmerge was entering endless loops under certain conditions when appending files. This was a regression introduced with the fix to #1774 (using very large --sync values causing mkvmerge to abort).
MKVToolNix GUI: new feature: added options in the preferences to only show the list of often used languages/country codes/character sets in their respective selections instead of both the often used and the full list. Implements #1796.