Merge pull request #7 from moritz-t-w/fix-placeholder-handling

addons/form/nodes/FormLabel.gd

@@ -67,16 +67,20 @@ enum Mode {
 			for prop in ["placeholder_text", "text"]:
 				if has_property(input, prop):
 					if mode == Mode.IN_INPUT:
+						if input[prop] != text:
+							input_text_backup = input[prop]
 						input[prop] = text
-					else:
-						input[prop] = ""
+					elif input[prop] == text:
+						input[prop] = input_text_backup
 					found = true
 					break
 			if !found&&mode == Mode.IN_INPUT:
 				push_error("Input ", input.get_instance_id(), " has no placeholder_text or text property")
 				mode = Mode.SEPARATE
 				visible = true
 
+var input_text_backup := ""
+
 ## Sets the label text to the input's name if it is empty and runs necessary setters
 func _enter_tree():
 	if input != null&&text in [null, ""]:
@@ -158,8 +162,10 @@ func indicate_validity(
 				print(msg)
 	return valid
 
-## Return validity of "Subject has property_name and it is not a method"
+## Return validity of "Subject exist, has property_name and property_name is not a method"
 func has_property(subject: Object, property_name: StringName) -> bool:
+	if subject == null:
+		return false
 	return property_name in subject&&!subject.has_method(property_name)
 
 ## Indicate validity on GUI input if event is relevant and validate_on_input