Column headers in list view disappear when column autosize is used on a "scrolled down" list

Column headers in list view disappear when column autosize is used on a "scrolled down" list

ROS : 0.4.15-dev-88-gf86a0e4

• Open a list with a header and enough elements to have a VSCROLL. Let's take System Environment variable as an example
• Scroll down to the botton (See "initial" screenshot)
• Double click on a header's column separator (to force autosize) (See "action" screenshot)
• Header disappears and underneath item is displayed instead. Impossible to recover correct display until full re-initialization of the Dialog. (See "final" screenshot)