Problem:    No test for verbose output of :call.
Solution:   Add a test.

Problem:    Vim9: no line continuation allowed in method call.
Solution:   Handle line continuation in expression before method call.

Problem:    Inconsistent naming of get_list_tv() and eval_dict().
Solution:   Rename get_list_tv() to eval_list().  Similarly for eval_number(),
            eval_string(), eval_lit_string() and a few others.

Problem:    Vim9: line continuation does not work in function arguments.
Solution:   Pass "evalarg" to get_func_tv().  Fix seeing double quoted string
            as comment.

Problem:    Still crashing when using s:variable.
Solution:   Remove assignment. (Ken Takata)

Problem:    Mouse left-right scroll is not supported in terminal window.
Solution:   Implement mouse codes 6 and 7. (Trygve Aaberge, closes #6363)

Problem:    'imactivatefunc' and 'imstatusfunc' are not used in the GUI.
Solution:   Adjust the #ifdefs. (closes #6367)

Problem:    Crash when trying to use s: variable in typed command.
Solution:   Don't use the script index when not set. (Ken Takata,
            closes #6366)

Problem:    Insufficient test coverage for Lua.
Solution:   Add tests. (Yegappan Lakshmanan, closes #6368)  Fix uncovered
            memory leak.  Avoid unnecessary copy/free.

Problem:    Coverity warnts for possible NULL pointer use.
Solution:   Check "pbyts" is not NULL.