ISSUE-5984 Avoid enter editing in non selectable object

src/mixins/itext_click_behavior.mixin.js

@@ -60,16 +60,26 @@ fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.protot
     this.initClicks();
   },
 
+  /**
+   * Default handler for double click, select a word
+   */
+  doubleClickHandler: function(options) {
+    this.selectWord(this.getSelectionStartFromPointer(options.e));
+  },
+
+  /**
+   * Default handler for triple click, select a line
+   */
+  tripleClickHandler: function(options) {
+    this.selectLine(this.getSelectionStartFromPointer(options.e));
+  },
+
   /**
    * Initializes double and triple click event handlers
    */
   initClicks: function() {
-    this.on('mousedblclick', function(options) {
-      this.selectWord(this.getSelectionStartFromPointer(options.e));
-    });
-    this.on('tripleclick', function(options) {
-      this.selectLine(this.getSelectionStartFromPointer(options.e));
-    });
+    this.on('mousedblclick', this.doubleClickHandler);
+    this.on('tripleclick', this.tripleClickHandler);
   },
 
   /**
@@ -107,9 +117,9 @@ fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.protot
     if (!this.canvas || !this.editable || (options.e.button && options.e.button !== 1)) {
       return;
     }
-    if (this === this.canvas._activeObject) {
-      this.selected = true;
-    }
+    // we want to avoid that an object that was selected and then becomes unselectable,
+    // may trigger editing mode in some way.
+    this.selected = this === this.canvas._activeObject;
   },
 
   /**

test/unit/itext_click_behaviour.js

@@ -15,6 +15,65 @@
     var selection = iText._getNewSelectionStartFromOffset({ y: 1, x: 1000 }, 500, 520, index, jlen);
     assert.equal(selection, index, 'index value did not change');
   });
+  QUnit.test('doubleClickHandler', function(assert) {
+    var iText = new fabric.IText('test need some word\nsecond line');
+    iText.canvas = canvas;
+    var eventData = {
+      which: 1,
+      target: canvas.upperCanvasEl,
+      clientX: 40,
+      clientY: 10
+    };
+    iText.doubleClickHandler({
+      e: eventData
+    });
+    assert.equal(iText.selectionStart, 0, 'dblClcik selection start is');
+    assert.equal(iText.selectionEnd, 4, 'dblClcik selection end is');
+    var eventData = {
+      which: 1,
+      target: canvas.upperCanvasEl,
+      clientX: 40,
+      clientY: 60
+    };
+    iText.doubleClickHandler({
+      e: eventData
+    });
+    assert.equal(iText.selectionStart, 19, 'second dblClcik selection start is');
+    assert.equal(iText.selectionEnd, 26, 'second dblClcik selection end is');
+  });
+  QUnit.test('tripleClickHandler', function(assert) {
+    var iText = new fabric.IText('test need some word\nsecond line');
+    iText.canvas = canvas;
+    var eventData = {
+      which: 1,
+      target: canvas.upperCanvasEl,
+      clientX: 40,
+      clientY: 10
+    };
+    iText.tripleClickHandler({
+      e: eventData
+    });
+    assert.equal(iText.selectionStart, 0, 'tripleClick selection start is');
+    assert.equal(iText.selectionEnd, 19, 'tripleClick selection end is');
+    var eventData = {
+      which: 1,
+      target: canvas.upperCanvasEl,
+      clientX: 40,
+      clientY: 60
+    };
+    iText.tripleClickHandler({
+      e: eventData
+    });
+    assert.equal(iText.selectionStart, 20, 'second tripleClick selection start is');
+    assert.equal(iText.selectionEnd, 31, 'second tripleClick selection end is');
+  });
+  QUnit.test('_getNewSelectionStartFromOffset end of line', function(assert) {
+    var iText = new fabric.IText('test need some word\nsecond line');
+    var index = 10;
+    var jlen = 20;
+    var selection = iText._getNewSelectionStartFromOffset({ y: 1, x: 1000 }, 500, 520, index, jlen);
+    assert.equal(selection, index, 'index value did not change');
+  });
   QUnit.test('_getNewSelectionStartFromOffset middle of line', function(assert) {
     var iText = new fabric.IText('test need some word\nsecond line');
     var index = 10;