Make Emacs respond to NS activation clicks

* src/nsterm.m (acceptsFirstMouse): Opt into receiving mouse events that
activate the window. (bug#76629)

src/nsterm.m

@@ -6820,6 +6820,13 @@ - (BOOL)acceptsFirstResponder
   return YES;
 }
 
+/* Tell NS we want to accept clicks that activate the window */
+- (BOOL)acceptsFirstMouse:(NSEvent *)theEvent
+{
+  NSTRACE_MSG ("First mouse event: type=%ld, clickCount=%ld",
+               [theEvent type], [theEvent clickCount]);
+  return YES;
+}
 - (void)resetCursorRects
 {
   NSRect visible = [self visibleRect];