updated prop line edit signal.

Author: jchanvfx

NodeGraphQt/widgets/properties.py

@@ -189,7 +189,8 @@ def focusOutEvent(self, event):
         self.__prev_text = ''
 
     def _on_return_pressed(self):
-        self.value_changed.emit(self.toolTip(), self.get_value())
+        if self.__prev_text != self.text():
+            self.value_changed.emit(self.toolTip(), self.text())
 
     def get_value(self):
         return self.text()