Bug#1128961: xterm: selection not fully cleared after text changes

On Sun, Apr 19, 2026 at 03:18:28AM +0200, Vincent Lefevre wrote:
> On 2026-04-18 12:21:25 -0400, Thomas Dickey wrote:
> > On Fri, Apr 17, 2026 at 03:35:17PM +0200, Vincent Lefevre wrote:
> > > On 2026-04-14 03:38:55 -0400, Thomas Dickey wrote:
> > > > fixed in #409
> > > 
> > > Thanks, this has much improved, but the behavior is still strange.
> > > For instance, after selecting the full body
> > > 
> > > ----------------------------------------
> > > z
> > > 
> > > 1234
> > > 123456
> > > 12345678
> > > 1234567
> > > 12
> > > 
> > > 123456
> > > 1234
> > > 12
> > > ----------------------------------------
> > > 
> > > and typing the <Down> key, the first two lines ("z" and the blank
> > > line that follows) are still selected. In case this is regarded
> > > as an expected behavior to keep a common part of the selection,
> > > this is inconsistent, because when I type the <Up> key to go back
> > > to the first message, the selection is entirely cleared.
> > 
> > That's "expected behavior".  In the example you reported, ncurses is
> > setting a scrolling region in the middle of the screen.  It does that
> > to move some lines up or down - and the selection moved with the text.
> 
> But note that the <Down> key makes Mutt display a different mail
> message. It happens that there are common lines, but this is just a
> coincidence. So it is quite strange that this is seen as a scroll.
> This may be an issue coming from ncurses.

no -- ncurses can't tell if xterm (or any other terminal) has a selection
highlighted.

keep in mind that (although one can construct examples by knowing the area
to investigate), this is the first report in about 20 years.

-- 
Thomas E. Dickey <[email protected]>
https://invisible-island.net

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