4560d9a3fe
In order to allow extensions being registered at fixed opcodes, there need to be a reserved slot range. Thus `NumExtensions` needs to start out with the upper ceiling of the reserved slot space. Thus it cannot tell whether the array already had been allocated, and some slots now may be NULL, so we need some extra checks. Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
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