And got rid of message pumping in unix/window.c. Woo! Gotta clean it up a bit first though...

unix/window.c

@@ -165,15 +165,35 @@ void uiWindowContentSize(uiWindow *w, int *width, int *height)
 // TODO can't reduce the size this way
 void uiWindowSetContentSize(uiWindow *w, int width, int height)
 {
+	GtkAllocation childAlloc;
+	gint winWidth, winHeight;
+
 	dbgPrintSizes(w, "BEFORE SET");
 
-	w->changingSize = TRUE;
+	// we need to resize the child holder widget to the given size
-	gtk_widget_set_size_request(w->childHolderWidget, width, height);
+	// we can't resize that without running the event loop
-	// MAJOR TODO REMOVE THIS.
+	// but we can do gtk_window_set_size()
-	while (w->changingSize)
+	// so how do we deal with the differences in sizes?
-		if (!uiMainStep(1))
+	// simple arithmetic, of course!
-			break;			// stop early if uiQuit() called
+
-	gtk_widget_set_size_request(w->childHolderWidget, -1, -1);
+	// from what I can tell, the return from gtk_widget_get_allocation(w->window) and gtk_window_get_size(w->window) will be the same
+	// this is not affected by Wayland and not affected by GTK+ builtin CSD
+	// so we can safely juse use them to get the real window size!
+	// since we're using gtk_window_resize(), use the latter
+	gtk_window_get_size(w->window, &winWidth, &winHeight);
+
+	// now get the child holder widget's current allocation
+	gtk_widget_get_allocation(w->childHolderWidget, &childAlloc);
+	// and punch that out of the window size
+	winWidth -= childAlloc.width;
+	winHeight -= childAlloc.height;
+
+	// now we just need to add the new size back in
+	winWidth += width;
+	winHeight += height;
+	// and set it
+	// TODO will this move the window?
+	gtk_window_resize(w->window, width, height);
 
 	dbgPrintSizes(w, "AFTER SET");
 }