Window rule to override input:follow_mouse behaviour

[alanpq]

Dogpatch anon demos guy here with the prophesized feature request.

Basically the title - while having follow_mouse 1 globally, it would be useful to have specific windows act as if follow_mouse 2 is set (windows that eagerly eat your cursor are annoying to move with follow_mouse 1)

[vaxerski]

this is a FR ffs

[vaxerski]

promoted #9946