Variable: nobreak-char-display
nobreak-char-display is a variable defined in C source code.
Value
t
Documentation
Control highlighting of non-ASCII space and hyphen chars.
If the value is t, Emacs highlights non-ASCII chars which have the
same appearance as an ASCII space or hyphen, using the nobreak-space
or nobreak-hyphen face respectively.
All of the non-ASCII characters in the Unicode horizontal whitespace character class, as well as U+00AD (soft hyphen), U+2010 (hyphen), and U+2011 (non-breaking hyphen) are affected.
Any other non-nil value means to display these characters as an escape glyph followed by an ordinary space or hyphen.
A value of nil means no special handling of these characters.
Probably introduced at or before Emacs version 22.1.
Source Code
C code is not yet loaded.