Blender Git Loki

Fix click-drag regression in fix for T86116

1638af109e46522a1a24645289016922bb9ca977 &
bfc70a6a958b9c35bde765ea8a02e8b1fd36db8b
caused a regression with click-drag (not tweak which has it's own logic).

Restore some changes from these commits with added comments.

Minor changes from previous functionality from
39919e35326c732141bfd2d740b19000b6bc1d51.

- `prevval` & `prevtype` are now set for all kinds of new events
in the queue previously this was not done for some kinds of events
(mouse wheel, ndof - for example).

- Set `prevval` & `prevtype` for other windows for mouse buttons.