Hi all,
please review the fix
http://cr.openjdk.java.net/~bagiras/8027628.1/
for
https://bugs.openjdk.java.net/browse/JDK-8027628
The issue affects all top-level windows. XConfigureEvent.x and
XConfigureEvent.y fields
from ConfigureNotify event could have wrong values, e.g. when the window
is resized by not moved.
That's why manual calculation was added.
This is explained in ICCCM, in "4.1.5. Configuring the Window" section:
"Advice to Implementors
Clients cannot distinguish between the case where a top-level window is
resized and moved from the case where the window is resized but not
moved, since a real ConfigureNotify event will be received in both
cases. Clients that are concerned with keeping track of the absolute
position of a top-level window should keep a piece of state indicating
whether they are certain of its position. Upon receipt of a real
ConfigureNotify event on the top-level window, the client should note
that the position is unknown. Upon receipt of a synthetic
ConfigureNotify event, the client should note the position as known,
using the position in this event. If the client receives a KeyPress ,
KeyRelease , ButtonPress , ButtonRelease , MotionNotify , EnterNotify ,
or LeaveNotify event on the window (or on any descendant), the client
can deduce the top-level window's position from the difference between
the (event-x, event-y) and (root-x, root-y) coordinates in these events.
Only when the position is unknown does the client need to use the
TranslateCoordinates request to find the position of a top-level window."
Thanks,
Oleg
