I was running through some code today in JSHint and it was complaining about "Mixed spaces and tabs."
What? I always use tabs so I was curious where the spaces where... Sure enough on looking there were spaces! Doh.
Then I noticed something in Sublime:
Do you see it?
Before 'displayStipulator' there is '....----' and before 'doChanged' it's '----....'. When selecting text in Sublime the tabs '----' and spaces '....' are highlighted for you!
Now that I know this is there I'll be more aware and cleanup spaces when I see them!
Update: Digging through the preferences, there is an option for this:
// Set to "none" to turn off drawing white space, "selection" to draw only the // white space within the selection, and "all" to draw all white space "draw_white_space": "all",
Also note you can easily convert from one to the other via View > Indentation > Convert...