backspacing from start of a subtask line in taskeditor is clunky

[Bryce Harrington]

When editing a task with a subtask, if you backspace the tasklist title until there is just a -> left, and then backspace one more time, instead of deleting the line and going to the previous line, the -> changes into a smaller -> character with a space character afterwards. It takes three more backspaces to clear the space, the small arrow, and the newline.

This is inconsistent with the behavior if you hit return after a subtask and then backspace. In this case it takes only 2 backspaces to clear the arrow and move to the previous line.

[Bryce Harrington (bryce)]

This behavior also shows up if you highlight the entire line of a subtask and then backspace (Shift+Home, Bkspace). It shows a smaller arrow and space char (highlighted), which requires an extra Bkspace to clear.

[Luca Invernizzi (invernizzi)]

I'll add that this behaviour messes with the undo/redo function that I was developing (for the taskeditor, not the taskbrowser).
Lionel and I have looked into solving this without much luck. Any insighful breakthough here will be greatly appreciated.