GitLab

(QCOMPOUND_TEXT): New variable.
(symbol_to_x_atom): Handle it.
(selection_data_to_lisp_data): Decode a selection data if
selection type is TEXT or COMPOUND_TEXT.
(lisp_data_to_selection_data): Encode a text to COMPOUND_TEXT if
it contains multibyte characters.
(syms_of_xselect): Initialize and staticpro QCOMPOUND_TEXT.