better handling of migration of multi line text

distribution/ReleaseNotes.txt

@@ -1,6 +1,7 @@
 Release Notes
 
 planned as v0.13
+- Added a barrel shifter (thanks to roy77)
 - In case of oscillations almost all affected components are shown.
 - If an error occurs, the name of the affected circuit file is shown.
 - An input can have "high z" value as its default value.
@@ -18,8 +19,6 @@ planned as v0.13
 - Added zooming to measurement graphs.
 - Test results can be displayed as measurement graphs.
 - The Text component is able to show multiple lines.
-  CAUTION: If you modify the text in an text component created in the past, you have to
-           reenter the text.
 
 v0.12.1, released on 05. Jun 2016
 - added a fuse to simulate a PROM or PAL.

src/main/java/de/neemann/digital/draw/shapes/TextShape.java

@@ -32,8 +32,13 @@ public class TextShape implements Shape {
     public TextShape(ElementAttributes attr, PinDescriptions inputs, PinDescriptions outputs) {
         String text = attr.get(Keys.DESCRIPTION);
 
-        if (text.length() == 0)  // ToDo: used to show the text from old files.
+        if (text.length() == 0) { // ToDo: used to be compatible with old files. Can be removed in the future
             text = attr.getLabel();
+            if (text.length() > 0) {
+                attr.set(Keys.DESCRIPTION, text);
+                attr.set(Keys.LABEL, "");
+            }
+        }
 
         if (text.length() == 0)
             text = Lang.get("elem_Text");