ButtonRelease event when focus changed

[Rokas Kupstys]

Hello,

I am in this situation where i perform a drag operation which creates a 
new window under mouse cursor and starts moving it _NET_WM_MOVERESIZE 
atom, all without releasing mouse button. Problem is that neither window 
receives ButtonRelease event once drag operation is done, and 
application is stuck in a state where it thinks that left mouse button 
is still pressed. I am trying to fix this in GLFW. From my tests it 
seems that SDL does not have this problem and would send ButtonRlease 
event to newly focused window. I can not quite figure out how to enable 
this behavior though. Would anyone please advice what to do to make 
ButtonRelease always be sent to focused window, even if that window was 
not the one who received ButtonPress?

Thanks!

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-- Rokas Kupstys