[TCLCORE] CFV warning: TIP #698: Handle negative screen distances

[Jan N. <jan...@gm...>]

This is a CFV warning for TIP #698. for Tk 9.1+:
    Handle negative screen distances
    <https://core.tcl-lang.org/tips/doc/trunk/tip/698.md>

If you think this is a bad idea, speak up now. If not,
I'll start the vote in a few days.

Regards,
         Jan Nijtmans