How to reproduce it :

• add some tasks
• put the mouse over the label of a task, the field appears bordered to mean that it can be modified here
• click anywere on the label : nothing occurs
• double click on the label : the label is editable

That could be an expected behavior, but :

At the right side of the bordered field, there is a button.

• click on the button : nothing occurs
• double click on the button, the label is editable
  > that is not an expected behavior because it is a button. Buttons should active the edition mode as soon as we make the first clic.