Problem:    Command line completion popup menu positioned wrong when using a
            terminal window.
Solution:   Position the popup menu differently when editing the command line.
            (Yegappan Lakshmanan, closes vim/vim#10050, closes vim/vim#10035)

https://github.com/vim/vim/commit/1104a6d0c2004d39e9b6cb8f804d12b628a69869

The test in the patch looks a bit hard to understand.
Add a Lua test that is more straightforward.

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

A zero-width click label isn't assigned to any click definition, so its
function name should be freed when filling click definitions.

Click definitions are always filled for tabline, statusline and winbar,
so they should also be always filled for statuscolumn, otherwise it will
leak memory.

Note: this doesn't actually change the existing code much, because of a
typo in the existing code.

Problem:    Memory is leaked in tabline click definitions since
            https://github.com/neovim/neovim/pull/21008.
Solution:   Add back a call to `stl_clear_click_defs()` that was lost in
            the refactor PR.

Problem:    The default fold column, as well as the 'statuscolumn', were
            drawn unnecessarily/unexpectedly for virtual lines placed
            with `virt_lines_leftcol` set.
Solution:   Skip the column states if a virtual line with
            `virt_lines_leftcol` set will be drawn.

Problem:    The `'statuscolumn'` was not re-evaluated for wrapped lines,
            when preceded by virtual/filler lines. There was also no way
            to distinguish virtual and wrapped lines in the status column.
Solution:   Make sure to rebuild the statuscolumn, and replace variable
            `v:wrap` with `v:virtnum`. `v:virtnum` is negative when drawing
            virtual lines, zero when drawing the actual buffer line, and
            positive when drawing the wrapped part of a buffer line.

Now with try_end() including more exception info, E5500 looks like
redundant information.
Adjust tests for more exception information.

fix: properly close builtin popup in ext_popupmenu