Problem:    Stray logfile appears when running tests.
Solution:   Remove ch_logfile() calls.

Problem:    Cursor position wrong with wrapping virtual text in empty line.
Solution:   Adjust handling of an empty line. (closes #10875)

Problem:    Cursor position wrong with virtual text before Tab.
Solution:   Use the byte length, not the cell with, to compare the column.
            Correct tab size after text prop. (closes #10866)

Problem:    Cursor position wrong with 'virtualedit' and mouse click after end
            of the line. (Hermann Mayer)
Solution:   Do not use ScreenCols[] when 'virtualedit' is active.
            (closes #10868)

Problem:    Checking character options is duplicated and incomplete.
Solution:   Move checking to check_chars_options(). (closes #10863)

Problem:    Spell checking for capital not working with trailing space.
Solution:   Do not calculate cap_col at the end of the line. (Christian
            Brabandt, closes #10870, issue #10838)

Problem:    No error for using "#{ comment" in a compiled function.
Solution:   Make error checking for "#{" consistent. (closes #10855)

Problem:    Assert fails only on MS-Windows.
Solution:   Disable the assert for now.

Problem:    Trying to allocate zero bytes.
Solution:   Do not allocate the proptype array when there are none.
            (closes #10867)

Problem:    Quickfix line highlight is overruled by 'cursorline'.
Solution:   Reverse the combination of attributes. (closes #10654)