I am lead developer on several projects that use outside developers. While in theory maybe I should be able to say my projects use margin width of 2 not the default 4 and whatever other little particulars I have about formatting source. But as I have to review more code commits I think this is just another eaxample of what Jimmy Boggard was saying in Tabs versus spaces: Spaces won. It is just not worth my time to keep reviewing commits and try and figure out which changes are real and which are not...I have better things to worry about than horizontal whitespace differences or trying to get other people to change their settings.
So today I will change my tab setting to 4 and move on to important issues like vertical whitespace and brace placement.