evas - fix smart clipped if a move happens to recurse within itself

evas - fix smart clipped if a move happens to recurse within itself

so since this uses new pos - cur pos to move BY x pixels... there is
an issue that if the move of the obj ends up re-moving the current obj
TO the same pos. it moved BY the same delta again thus racing ahead.
not great. because x/y is not stored until the call stack returns to
after the smart move func and the pos set storce the new position in
the object struct. the easiest way atm until we have relative
positioning etc. is to store this in the smart obj and use the delta
at that time of the call then store it immediately so a recursion ends
up with a delta of 0 if its the same pos, so go back to where we were.

this fixes a nasty issue i spotted in fileselector that made filesel
icons race along when scrolling 2x as fast as everything else. oddly i
couldnt see this in any other widget that scrolled when i looked...
which is odd, but... either way a nasty issue... subtle... and now
fixed. never saw this before so this seems new.