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workspace.listen(sync.api.Workspace.EventType.EDITOR_LOADED, function(e) {
  var editor = e.editor;
  var selectionManager = editor.getSelectionManager ();
}); 

Code: Select all

workspace.currentEditor.getSelectionManager().listen(sync.api.SelectionManager.EventType.SELECTION_CHANGED, () => {
  var selectionManager = workspace.currentEditor.getSelectionManager();
  
  // Prerequisite knoledge: The document position (like a caret) reffers the tag or character to the right of it.
  var caretInformation = selectionManager.getSelection().getCaretPositionInformation();
  if (selectionManager.getSelection().getCaretPositionInformation().isOnStartTag() ) {// Check if the selection's caret is on a start tag (a start tag follows the caret)
    // Handles the case when selection ends before a start tag ( <b>abc SEL_START def</b> SEL_END <i>  ... )
    
    // Checks if just an end tag is selected (unbalanced selection) by comparing the element denoted by selection's start position against the previous sibling of the node denoted by the caret position.
    var nodeAtCaret = caretInformation.getNodeOfTag();// Store the node corresponding to the start tag present at the caret position.
    var isJustEndTagSelected = nodeAtCaret.previousSibling?.isSameNode(selectionManager.getSelection().getNodeAtSelectionStart());
    if( isJustEndTagSelected) {
      // Extend the selection to cover the start tag too.
      selectionManager.setSelection(selectionManager.createAroundNode((selectionManager.getSelection().getNodeAtSelectionStart())));
    }
  } else if (selectionManager.getSelection().getCaretPositionInformation().isOnEndTag()) {// Check if the selection's caret is on an end tag (an end tag follows the caret)
    // Handles the case when selection ends before a wrapping element ( <i><b>abc SEL_START def</b> SEL_END </i> 

    var nodeAtCaret = caretInformation.getNodeOfTag();// Store the node corresponding to the end tag present at the caret position.
    var isJustEndTagSelected = nodeAtCaret.isSameNode(selectionManager.getSelection().getNodeAtSelectionStart().parentNode);
    if( isJustEndTagSelected) {
      // Extend the selection to cover the start tag too.
      selectionManager.setSelection(selectionManager.createAroundNode((selectionManager.getSelection().getNodeAtSelectionStart())));
    }
  } else if (selectionManager.getSelection().getCaretPositionInformation().isOnText()) { // Check if the selection caret is on text (a text follows the caret)
    // Handles the case when selection ends before a text node ( <b>abc SEL_START def</b> SEL_END ghi )

    // Checks if just an end tag is selected (unbalanced selection) by comparing the element denoted by selection's start position against the previous sibling of the text node denoted by the caret position.
    var textNodeAtCaret = selectionManager.getSelection().getNodeAtSelectionEnd(true); // Store the text node corresponding at the caret position.
    var isJustEndTagSelected = textNodeAtCaret.previousSibling?.isSameNode(selectionManager.getSelection().getNodeAtSelectionStart());
    if( isJustEndTagSelected) {
      // Extend the selection to cover the start tag too.
      selectionManager.setSelection(selectionManager.createAroundNode((selectionManager.getSelection().getNodeAtSelectionStart())));
    }
  }
});