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There are two keyboard shortcuts that can be used for cycling through the opened file tabs:
Ctrl + Tab (Command + Tab on OS X)
Switches between the tabs with opened files in the order most recent ones first.
Ctrl + Shift + Tab (Command + Shift + Tab on OS X)
Switches between the tabs with opened files in the reverse order.
There are also two shortcuts for moving the current tab:
Ctrl + Alt + Comma
Moves the current file tab one position to the left.
Ctrl + Alt + Period
Moves the current file tab one position to the right.