Xext: shape: clean up Xinerama dispatch
Simplify the dispatching by moving the branching between Xinerama vs. single screen into the actual request handlers.
Also a preparation for #1701
Edited by Enrico Weigelt, metux IT consult
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Simplify the dispatching by moving the branching between Xinerama vs. single screen into the actual request handlers.
Also a preparation for #1701