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Do not error on missing ZWNJ (ligature break) characters.

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Since TeXLive 2016, "fontspec" maps the ligature break command
\textcompwordmark to the ZWNJ character (U+200C).
This character is missing in many fonts (including the default: Latin
Modern) which leads to "Missing character" warnings in the XeTeX/LuaTeX
log file if a document using non-TeX fonts contains a ligature break.

LyX reports missing characters as error since fixing #9610.
In case of "invisible" characters, there is no data loss, in case of the
ZWNJ the functionality is kept: ligatures are prevented also if the ZWNJ
is missing in a font.

Therefore, a missing ZWNJ is now treated similar to missing characters
in "nullfont" (see [63f41711/lyxgit], bug #10394) and does not trigger
an error.

Fixes: #10727
This commit is contained in:
Juergen Spitzmueller 2017-07-23 18:41:06 +02:00
parent 3c7b75c5bc
commit a40868510d
1 changed files with 12 additions and 5 deletions
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17
src/LaTeX.cpp
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@ -936,11 +936,18 @@ int LaTeX::scanLogFile(TeXErrors & terr)
// Warning about missing glyph in selected font
// may be dataloss (bug 9610)
// but can be ignored for 'nullfont' (bug 10394).
retval |= LATEX_ERROR;
terr.insertError(0,
from_local8bit("Missing glyphs!"),
from_local8bit(token),
child_name);
// as well as for ZERO WIDTH NON-JOINER (0x200C) which is
// missing in many fonts and output for ligature break (bug 10727).
// Since this error only occurs with utf8 output, we can safely assume
// that the log file is utf8-encoded
docstring const utoken = from_utf8(token);
if (!contains(utoken, 0x200C)) {
retval |= LATEX_ERROR;
terr.insertError(0,
from_ascii("Missing glyphs!"),
utoken,
child_name);
}
} else if (!wait_for_error.empty()) {
// We collect information until we know we have an error.
wait_for_error += token + '\n';