[PATCH v2 1/3] Handle CJK wide glyph rendering

[Bill Spitzak]

The wcwidth is necessary to make the terminal and the curses library 
agree and should only be used to interpret how to turn the incoming data 
into a resulting display. After that you have the glyphs you want to 
draw on the screen and you should use that to figure out where to draw 
underscores and cursors.

I recommend a new fix that uses the width of the same string being drawn 
to place the underscore and cursor, so it will always line up whether or 
not the font is one of the (nonexistent) set that actually agrees with 
wcwidth, and will work with proportionally spaced fonts. For a demo 
client I would skip trying to interpret wcwidth on incoming text, just 
act like each glyph takes one character cell.

Peng Wu wrote:
> Some CJK glyphs are wide, which occupy two columns.
> If the glyph is wide, then use two columns instead of one.