force visible widths to 2 columns for CJK maps which use 2 bytes per
* src/iso2022.c(_vte_iso2022_map_get): force visible widths to 2 columns for CJK maps which use 2 bytes per character. * src/iso2022.c(_vte_iso2022_fragment_input): recognize CSI/OSC/PM sequences as control sequences and not raw text, allowing us to treat them specially later. * src/iso2022.c(process_control): pass CSI/OSC/PM sequences through unmodified (without going through maps).
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