1. Open a Word List in Grid view.
2. Click in any field to put it in edit mode.

3. Press Tab or Escape and notice that you leave edit mode. This is as expected.

4. Click in any field to put it edit mode once again.
5. Now click in the Add Lemma edit box down below or in the Title of the Word List above.

Result: This time, though the focus is also lost from the field that was in edit mode, it stays in edit mode. Pressing Escape at this point does not get you out of edit mode, because the focus is elsewhere so the Escape key doesn't go to the edit control. The only way to get out is to click back in the control that's in edit mode and then press Escape.
Expect: It should not stay in edit mode when the focus is lost via a mouse click, just as tabbing away from that field gets you out of edit mode.