Summary: List of input sources
List of input source identifiers available. Each source is specified as a tuple of 2 strings. The first string is the type and can be one of 'xkb' or 'ibus'. For 'xkb' sources the second string is 'xkb_layout+xkb_variant' or just 'xkb_layout' if a XKB variant isn't needed. For 'ibus' sources the second string is the IBus engine name. An empty list means that the X server's current XKB layout and variant won't be touched and IBus won't be used.
In the array, there must be one and only one while space behind the comma(,).
Or else, the default value can't be restored