If just switching 2 windows by clicking, we only see these 2
windows changing their frame(such as title bar become bright or dim), while
their content changing nothing.
So, How does client make server do this? I mean how do make
server only change window's frame? and which request sent from
client(X_ConfigureWindow does not did this), or Event server will return to
client?
Or it is just controled by window manager in local side? not
through XServer?
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