wrapping of too long tab title in the prompt to close modified untitled tab plugin API 'on_click_right' it allows 'Spell Checker' to update its context menu items more gracefully
* change: rename some encodings to pretty names: big5, gbk, shift-jis, uhc (old names 'cpNNN' still work when loading old sessions) support more encodings, but note: they require OS support (unlike old encodings):
