According to the documentation, these settings should do the trick (they work for me):
{ // Integer. The number of spaces a tab is considered equal to "tab_size": 4, // Boolean, if true, spaces will be inserted up to the next tab stop when tab is pressed, rather than inserting a tab character "translate_tabs_to_spaces": true, // Boolean, if true (the default), tab_size and translate_tabs_to_spaces will be calculated automatically when loading a file "detect_indentation": true, // Boolean, If translate_tabs_to_spaces is true, use_tab_stops will make tab and backspace insert/delete up to the next tab stop "use_tab_stops": true }
If this does not work, try disabling all the plugins, restarting them and see if the problem persists. If not, this is one of the plugins (or several conflicting ones). You can find out by turning them on one by one and look for the problem to reappear.
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