patch 8.0.1258: 'ttymouse' is set to "sgr" even though it's not suppo…

…rted

Problem:    'ttymouse' is set to "sgr" even though it's not supported. (Gary
            Johnson)
Solution:   Adjust #ifdef

patch 8.0.1257: no test for fix of undefined behavior

Problem:    No test for fix of undefined behavior.
Solution:   Add a test. (closes vim#2255)

patch 8.0.1256: typo in configure variable vim_cv_tgent

Problem:    Typo in configure variable vim_cv_tgent. (Matthieu Guillard)
Solution:   Rename the variable. (closes vim#2281)

patch 8.0.1255: duplicate badge README file

Problem:    duplicate badge README file.
Solution:   Remove one. (Dominique Pelle)

patch 8.0.1254: undefined left shift in gethexchrs()

Problem:    Undefined left shift in gethexchrs(). (geeknik)
Solution:   Use unsigned long. (idea by Christian Brabandt, closes vim#2255)

patch 8.0.1253: still too many old style tests

Problem:    Still too many old style tests.
Solution:   Convert a few more tests to new style. (Yegappan Lakshmanan,
            closes vim#2272)

patch 8.0.1252: incomplete translations makefile for MinGW/Cygwin

Problem:    Incomplete translations makefile for MinGW/Cygwin.
Solution:   Add missing source files.  Make it work with msys2's bash. (Ken
            Takata)

patch 8.0.1251: invalid expressin passed to WaitFor()

Problem:    Invalid expressin passed to WaitFor().
Solution:   Check if the variable exists.

patch 8.0.1250: 'hlsearch' highlighting not removed after incsearch

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 vim#2267)

patch 8.0.1249: no error when WaitFor() gets an invalid wrong expression

Problem:    No error when WaitFor() gets an invalid wrong expression.
Solution:   Do not ignore errors in evaluationg the expression.  Fix places
            where the expression was wrong.