Delete/backspace when using softtab

When using soft tabs, backspace/delete at the beginning of an indented line only deletes one space instead of all the space matching a soft tab.

For example, say I have set my tab width to 4 spaces and use soft tabs, then if I have a line with an indent of two tabs (8 spaces) and then enter a new line and want to outdent it one tab (to 4 spaces), I'd usually hit backspace and expect one tab to be deleted (4 spaces), instead only 1 space is deleted (leaving 7 spaces).

Using shift-tab at the beginning of a line does work, but I'd argue it makes sense to do this for backspace as well (other editors do that, including Textatic on macOS AFAICT).