Problem: Using `<C-W>w`, `<C-W>W` or the ":wincmd" variants with a count can
enter unfocusable or hidden floating windows. This is especially problematic
when using the new in-development extui, which creates many unfocusable floats
for various UI elements.
Solution: Skip unfocusable and hidden floating windows. Instead, skip to the
next focusable, non-hidden window in the current tabpage's window list. Reword
the documentation a bit (hopefully an improvement?)
(cherry picked from commit 403fcacfc1)