Writing a colored character into a gap created by \t recolors the entire gap

[Oleg A.P.]

On Sat, Mar 28, 2020 at 12:51:27AM +0100, Marc Lehmann wrote:
> On Wed, Mar 25, 2020 at 06:53:19PM +0400, "Oleg A.P." <urxlist at dev-random.ru> wrote:
> > This behavor does not match other terminals and is not expected by 
> > NCurses. The conditions for the bug are rather rare but they do happen.
> 
> Hi, this behaviour is correct - by default, urxvt handles tab as a wide
> character, rather than a cursor movement. You can switch this behaviour
> off using "+ptab" (see manpage for details on this option).

Then how do you suggest application authors/maintainers to deal with the 
fact that this behavior is incompatible with NCurses? Tell the users 
that they must use +ptab? Refuse to run on rxvt-unicode?

Maybe you could make it so that when a wide character is replaced with a 
narrow character, the remaining gap is filled with the wide character's 
original color and not with the narrow character's new color? That would 
fix the incompatibility while keeping tabs "pastable".