Problem:    The 'statuscolumn' width is being estimated without the
            proper context. In particular, this resulted in the fact
            that a custom fold column could be included in the estimated
            `number_width()`, and doubly added when actually drawing the
            statuscolumn due to `win_col_off()` also adding the
            `'foldcolumn'` width. Resulting in a status column that is
            `'foldcolumn'` cells wider than necessary.
Solution:   Estimate 'statuscolumn' width in `get_statuscol_str()` when
            a buffer's line count has changed.

This reverts commit 0371d0f7afa5e01dd2ac8bbd3abcf0f7454872b3.

> 'bufhidden' option exists. I don't think we should assume autoclosing
windows are fine just because 'hidden' is set.

Problem:
The "force" flag of win_close() complicates the code and adds edge cases
where it is not clear what the correct behavior should be.
The "free_buf" flag of win_close() is passed on to float windows when
closing the last window of a tabpage, which doesn't make much sense.

Solution:
Remove the "force" flag and always close float windows as if :close! is
used when closing the last window of a tabpage, and set the "free_buf"
flag for a float window based on whether its buffer can be freed.
As 'hidden' is on by default, this change shouldn't affect many people.

Problem:    When a folded line has virtual lines attached, the following
            problems occur:
              - The virtual lines are drawn empty.
              - The 'foldtext' line is drawn empty.
              - The cursor is drawn incorrectly.
Solution:   Check whether virtual lines belong to a folded line.

Fix #17027
Fix #19557
Fix #21837

Co-authored-by: zeertzjq <zeertzjq@outlook.com>

Problem:    Some tests fail when run under valgrind.
Solution:   Increase timeouts.

https://github.com/vim/vim/commit/353c351bd22e4dac4c3ae9cd7731032348f248c4

Cherry-pick Test_pum_with_preview_win() from patch 8.2.0011.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Problem:    'statuscolumn' click definitions are cleared, evaluated,
            allocated and filled each redraw for every row in a window.
            This despite the fact that we only store a single click
            definition array for the entire column as opposed to one
            for each row.
Solution:   Only fill the 'statuscolumn' click definition array once per
            window per redraw.

Resolve https://github.com/neovim/neovim/issues/21767.

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>