Documents used deprecated or lookalike characters missing in
Latin Modern system fonts:
Customization.lyx: "figure dash" instead of "emdash".
revtex4-1: "Angstrom sign" instead of "latin letter A with ring".
The specific test was introduced in ef6be5f4 because
CJKutf8 was relatively new (cf. lyx.org/trac/ticket/5386).
10 years on, CJKutf8 is an established part of the CJK bundle
and we can skip the special test for CJKutf8 to make the logic
considerabely simpler to read, maintain and debug.
If Document>Settings>Language>Encoding is set to any value except "auto" or "default", we
expect the whole document to use this encoding. Wiht encodings from the CJK package, this means
one big "CJK" environment and no encoding switches.
Characters that are not handled by the CJK package need to be "forced" in lib/unicodesymbols.
This is completed for "euc-cn", the others will follow.
The default fonts provide a good match to LatinModern and
closer similarity to the look with 8-bit TeX fonts.
Also replace a box-drawing character in a heading with an em-dash.
In the lines specifying the font, e.g.
\font_typewriter "DejaVuSansMono" "DejaVu Sans Mono"
the system font specs may contain words separated by spaces
If get_containing_layout() finds a layout without name,
it will return an empty string as layoutname.
Calling functions can thus differentiate between missing
\begin_layout and missing layoutname and give a more specific
response or warning.
For some .lyx files with long tables, this fix reduces the
differences in LaTeX export of master, compared to LaTeX export of
the lyx2lyx exported file. Further, this export fixes the lyx2lyx
roundtrip convergence for these cases. For discussion, see:
https://www.mail-archive.com/search?l=mid&q=20190102230924.7zgla5lhkwxpx5fi%40barna
The textcomp Unicode support file "ts1enc.dfu" defines 0x204E Low Asterisk
as \textasteriskcentered. LyX should follow suit.
The ASTERISK OPERATOR (correctly) maps to the same macro,
the "deprecated" tag marks the upstream mapping as preferred choice.
Added "force=iso8859-7" for some characters:
The iso8859-7.def file for the Greek 8-bit input encoding
used \textbullet as placeholder for non-defined characters.
This is fixed in v1.7 2019/01/08.
Once the fixed version is in common use, all "force=iso8859-7"
tags can be removed.
The Thai tis620-0 input encoding is supported via the inputenc "plug in"
(data) file tis620.def from https://ctan.org/pkg/babel-thai.
We can handle it like the other contributed input encodings, e.g.,
Greek (ISO 8859-7) and the several Cyrillic encodings from
http://www.ctan.org/pkg/latex-cyrillic.
Under TeXLive 2018, the input encoding defaults to utf8, if there is no call to
inputenc. The added test file fails without the patch but compiles fine, if the
file "tis620.def" is present in the TEXPATH.
