bug#34476: fluffy whitespace in the mode-line, despite it running off the screen

[martin rudalics]

> The function display_mode_line doesn't produce the updated mode-line
> contents for the selected window, it produces it for the window passed
> as its first argument W.  So instead of this:
>
>      && window_body_width (XWINDOW (selected_window), false) >=
>
> I think you should use this:
>
>      && window_body_width (w, false) >=

Better

          && WINDOW_TOTAL_COLS (w) >=

because the mode line covers the entire width of the window (think of
those people using extra large margins).

martin