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CSI 28 ; <c> t is a pre-KDE4-era (from the comments) extension to the control codes, where <c> was supposed to set the text-color on a tab. It is unimplemented since KDE4, and only generated a debug-message when used. Remove its implementation and the TODO's associated with "document the meaning of this parameter". Because there's no point in documenting an unimplemented thing.
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