Problem: Internal diff isn't used by default as advertised.
Solution: Add "internal" to the default value of 'diffopt'.
Also add couple of files missing from the distribution.
Problem: Using an external diff program is slow and inflexible.
Solution: Include the xdiff library. (Christian Brabandt, closes#2732)
Use it by default.
Problem: Using a full path is supported for 'directory' but not for
'backupdir'. (Mikolaj Machowski)
Solution: Support 'backupdir' as well. (Christian Brabandt, closes#179)
Problem: Terminal window options are named inconsistently.
Solution: prefix terminal window options with "termwin". Keep the old names
for now as an alias.
Problem: Shell commands in the GUI use a dumb terminal.
Solution: Add the "!" flag to 'guioptions' to execute system commands in a
special terminal window. Only for Unix now.
Problem: If $SHELL contains a space then the default value of 'shell' is
incorrect. (Matthew Horan)
Solution: Escape spaces in $SHELL. (Christian Brabandt, closes#459)
Problem: It is difficult to set the python home directory properly for
Python 2.7 and 3.5 since both use $PYTHONHOME.
Solution: Add the 'pythonhome' and 'pythonthreehome' options. (Kazuki
Sakamoto, closes#1266)
Problem: Slow redrawing with DirectX.
Solution: Avoid calling gui_mch_flush() unnecessarily, especially when
updating the cursor. (Ken Takata, closes#2560)
Problem: MS-Windows: does not show colored emojis.
Solution: Implement colored emojis. Improve drawing speed. Make 'taamode'
work. (Taro Muraoka, Yasuhiro Matsumoto, Ken Takata, close#2375)
Problem: Cannot use imactivatefunc() unless compiled with +xim.
Solution: Allow using imactivatefunc() when not compiled with +xim.
(Yasuhiro Matsumoto, closes#2349)
Problem: Cannot use 'balloonexpr' in a terminal.
Solution: Add 'balloonevalterm' and add code to handle mouse movements in a
terminal. Initial implementation for Unix with GUI.
Problem: GUI window always resizes when adding/removing a scrollbar,
toolbar, etc.
Solution: Add the 'k' flag in 'guioptions' to keep the GUI window size and
change the number of lines/columns instead. (Ychin, closes#703)
Problem: 'hlsearch' highlighting not removed after incsearch (lacygoill)
Solution: Redraw all windows. Start search at the end of the match. Improve
how CTRL-G works with incremental search. Add tests. (Christian
Brabandt, Hirohito Higashi, haya14busa, closes#2267)
Problem: Incremental search only shows one match.
Solution: When 'incsearch' and and 'hlsearch' are both set highlight all
matches. (haya14busa, closes#2198)
