[ui] Elaborate more on drop events flags.

ui.lua

@@ -165,10 +165,11 @@ local function globalactions(ui, snap)
 end
 
 local function eventpropagate(ui, snap)
-    -- 1. Pointer events
+    -- Ignore event flags, in case focused widget requires direct input
     local dropPointer = ui.focused and ui.focused.grabpointer
     local dropAction = ui.focused and ui.focused.grabkeyboard
 
+    -- 1. Pointer events
     if snap.pointer and not dropPointer then
         local root = ui[1]
         local x,y,w,h = root.x,root.y,root.w,root.h