[Bug tui/30337] [gdb/tui] TUI in ansi terminal has off-by-one width problem

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30337

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> The problem seems to be related to this comment in Term::resize:
> ...
>         # Somehow the number of columns transmitted to gdb is one less      
> 
>         # than what we request from expect.  We hide this weird             
> 
>         # details from the caller.                                          
> 
>         _do_resize $_rows $cols
>         stty columns [expr {$_cols + 1}] < $::gdb_tty_name
> ...
> and indeed, after dropping the +1 in {$_cols + 1} the test passes (and ...
> without timeouts).

With "the test" I meant gdb.tui/empty.exp.

Without the patch, the test-case times out here:
...
        _do_resize $rows $_cols
        stty rows $_rows < $::gdb_tty_name
        # Due to the strange column resizing behavior, and because we           
        # don't care about this intermediate resize, we don't check             
        # the size here.                                                        
        wait_for "@@ resize done $_resize_count"
        incr _resize_count
...
because due to the garbling, the "@@ resize done $_resize_count" line is spread
over two lines.

In other words, the problem filed in this PR is not sufficiently worked around
in Term::resize.

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