Forgive me if this is not the right place to ask this.

I have  a program with a single window that uses XInput2 for mouse input. I set 
the event_mask field of the XSetWindowAttributes struct to "ExposureMask | 
StructureNotifyMask | KeymapStateMask | KeyPressMask | KeyReleaseMask", so I 
expect to not receive any EnterNotify or LeaveNotify events, yet if I press and 
hold a mouse button on my window, move the cursor out of the window and then 
back into the window, I get an EnterNotify event (the only reason the program 
even listens for these events is for compatibility with operating systems that 
don't have XInput2). I only get EnterNotify events, not LeaveNotify, and I only 
get them while holding a mouse button down. Curiously, this behaviour goes away 
if I call XIGrabDevice in response to a button press.

My question is: why does this happen? This looks like a bug and this issue is 
trivial to work around (I only even noticed because of an "assert" statement I 
added), but I want to make sure this isn't caused by me doing something wrong.
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