How to remove the error icon for correct ST-code?

If you enter and save a faulty ST-code, the ST-code is highlighted as faulty and the icon is displayed on the left edge. Usually this highlighting and the error icon are removed right after the faulty ST-code has been corrected. However, it is possible that the highlighting and the error icon are not removed in case of certain scenarios.

Example

Example
`PROGRAM Test` `VAR` `Var1 : INT;` `END_VAR` `Var1 := ADD(IN1 := 2, IN2 = 1);` `(* 'IN2 = 1' in this line is highlighted as error. The error icon is displayed for this line. )` `( When correcting 'IN2 = 1' to the correct syntax 'IN2 := 1', 'IN2 := 1' is still highlighted as error. The error icon is still displayed for this line. *)`

PROGRAM Test

VAR

   Var1 : INT;

END_VAR

  Var1 := ADD(IN1 := 2, IN2 = 1);

  (* 'IN2 = 1' in this line is highlighted as error. The error icon is displayed for this line. *)

  (* When correcting 'IN2 = 1' to the correct syntax 'IN2 := 1', 'IN2 := 1' is still highlighted as error. The error icon is still displayed for this line. *)

Workaround: Save the corrected ST-code so that the highlighting and the icon are removed.