fix #1131 (#1135)

Author: Owyn

src/LunaTranslator/gui/translatorUI.py

@@ -1247,6 +1247,8 @@ def afterrange(self, clear, rect):
             self.showhideocrrange()
         if globalconfig["ocrafterrangeselect"]:
             self.startTranslater()
+            if not globalconfig["keepontop"]:
+                windows.SetForegroundWindow(self.winid)
 
     def startTranslater(self):
         if gobject.baseobject.textsource: