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This adds supports for sub-parameters in control sequences. For now, it supports the colon-separated variants of SGR 38 and SGR 48 for RGB and indexed colours: CSI 38 : 2 : <id> : <red> : <green> : <blue> [ : ... ] m CSI 38 : 2 : <red> : <green> : <blue> m CSI 38 : 5 : <index8> m and likewise for SGR 48. <id> is ignored (it's supposed to be a colour space id, to support different kinds of RGB).
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