This function controls or reports on the Tcl service mode, i.e., whether Tcl will respond to events.
(logical) Whether event servicing is turned on.
If called with
on == NULL (the default), no change is made.
Note that this blocks all Tcl/Tk activity, including for widgets from other packages. It may be better to manage mapping of windows individually.
The value of the Tcl service mode before the call.
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