[ ExtendScript ] How to rotate a text frame properly? Just like the GUI does it.

Question

Hi together,
you might think it's the simplest thing to do using method rotate() on a selected text frame.
But somehow I cannot do this exactly like the GUI is doing this with the Transform panel.
 
Simple code:
app.activeDocument.selection[0].rotate( 20 );
 
Or if one likes to use a rotation matrix:
var rotationMatrix = app.getRotationMatrix( 20 );
app.activeDocument.selection[0].transform( rotationMatrix );
 
Here the result when doing this in the GUI, the new rotation angle is visible in the Transform panel of my German Illustrator 26.3.1 on Windows 10:

When I'm doing this with the code above, the "bounds" are not rotated, still there is value 0 in the rotation entry field of the Transform panel; the text contents is rotated like that:

What can I do to get the same result that I can get with the GUI?
 
Thanks,Uwe Laubender( Adobe Community Professional )

sttk3 · Accepted Answer

From what I have found, script does not seem to update the tag "BBAccumRotation" in the text frame.

When I updated it on my own, I got the same result as when I did it in the GUI.

rotateItem(app.activeDocument.selection[0], 20) ;

/**
  * rotate item and write rotation angle in tag
  * @9397041 {PageItem} targetItem pageItem
  * @9397041 {Number} angle rotation angle in degrees
  * @Return {}
*/
function rotateItem(targetItem, angle) {
  targetItem.rotate(angle) ;
  
  // writes rotation angle (in radians) to tags['BBAccumRotation']
  var tagName = 'BBAccumRotation' ;
  var rad = angle * (Math.PI / 180) ;
  try {
    var rotationInfo = targetItem.tags[tagName] ;
    rotationInfo.value = (Number(rotationInfo.value) + rad).toString() ;
  } catch(e) {
    var rotationTag = targetItem.tags.add() ;
    rotationTag.name = tagName ;
    rotationTag.value = rad.toString() ;
  }
}

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