Quickly re-indent file to two or four spaces tabsize. It basically performs:
View > Indentation > Convert Indentation to Tabs
View > Indentation > Tab width: 2/4
View > Indentation > Convert Indentation to Spaces
Open command pallete and type: "ReIndent". Two options will appear:
ReIndent: to 2
ReIndent: to 4
Just search for "ReIndent" in Package Control