Allow shift+tab to un-indent
Created originally on Bitbucket by samaursa (Saad Khattak)
When writing logs, I indent it for clarity with the tab key. Shift+Tab is a universal approach to un-indent quickly. Currently, I have to backspace a few times or press Shift+Home and delete to un-indent, although with more than one indent level, this becomes problematic. Shift+Tab has the same effect as Tab in the stable release.