to call our Xquartz-specific event handlers directly as mieqHandlers (cherry picked from commit 4aedba5aa727e22316e8ca456f7218bea9ee0313)
Leaving xpr unflattened since we want modularity to replace that with xpc (XPluginComposite) at some point (cherry picked from commit 48e6a75fbdd0fee86e364f02ace83f20b312a2b2)