[Editor] Sometimes when using shift+tab the result is not as expected

[Mitcheljager]

When trying to indent multiple lines at once by selecting a large chunk of text using shift+tab can cause wonky results. The selection will shift and miss align. This is most noticeable when including an empty line in your selection.
It's hard to explain, so here is a gif. Notice how the top line of my selection is removed when I press shift+tab.