bug#16594: 24.3.50; very slow redraw when resizing windows horizontally

[Paul Eggert]

Darren Hoo wrote:
> -  Fset_input_interrupt_mode (Qnil);
> +  Fset_input_interrupt_mode (Qt);

That reverses a change made 2009-01-29 10:36:22 +0000 by Adrian Robert 
in trunk bzr 94305.  The ChangeLog entry doesn't say why the change was 
made.  I'll CC: this to Adrian to see whether he can explain.  Adrian, 
the context for this email can be found at:

http://bugs.gnu.org/16594