2014-03-07 1:20 GMT+02:00 <[email protected]>: > On Thu, 6 Mar 2014, Richard Wordingham wrote: > > On Thu, 6 Mar 2014 22:38:07 +0200 > > Konstantin Ritt <[email protected]> wrote: > > > > > Did you meet any single font with glyph for U+0008 (BS)? Honestly, I > > > don't imagine what U+0008 glyph representation looks like :) > > > > Back one space! The underlining in Unix man pages is usually > > implemented as overstrike via U+0008. However, I'd forgotten that > > OpenType advance widths can't be negative, so it can't be rendered > > under font control. > > ECMA-17, or ISO 2047, is now withdrawn, but it specified a graphical > symbol for the control character we now call U+0008. The symbol > looked like an arrow running from lower right to upper left, with a > slight concave-downward curve. You can find a copy of the document here: > > http://www.ecma-international.org/publications/files/ECMA-ST-WITHDRAWN/ECMA-17,%201st%20Edition,%20November%201968.pdf > > Cool! The p2. "PURPOSE" states almost literally the same what I was describing by > 2) A "show document structure" rendering option, where some normally invisible characters are handled by a special font (i.e. to visualize some control characters, BiDi format characters, objects, etc.) This is a use-case I do care about, too.
Perhaps we'll need a separate flag to be able to choose between "hide <GC=Cc>" and "hide <GC=Cc> iff not present in the font".
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