Possible patch (can be directly used with `git apply')
diff --git a/source/texk/web2c/luatexdir/tex/postlinebreak.c
b/source/texk/web2c/luatexdir/tex/postlinebreak.c
index cbc77e556..9cd76b5fa 100644
--- a/source/texk/web2c/luatexdir/tex/postlinebreak.c
+++ b/source/texk/web2c/luatexdir/tex/postlinebreak.c
@@ -440,7 +440,7 @@ void ext_post_line_break(int paragraph_dir,
}
adjust_tail = adjust_head;
pre_adjust_tail = pre_adjust_head;
- if (adjust_spacing > 0) {
+ if (adjust_spacing > 1) {
just_box = hpack(q, cur_width, cal_expand_ratio, paragraph_dir);
} else {
just_box = hpack(q, cur_width, exactly, paragraph_dir);
On 12/5/19 10:04 AM, Henri Menke wrote:
Dear devs,
The \adjustspacing register is described in the LuaTeX manual as
follows:
When \adjustspacing has value 2, hz optimization will be applied to
glyphs and kerns. When
the value is 3, only glyphs will be treated. A value smaller than 2
disables this feature.
However, setting \adjustspacing=1 will only disable shrink but not
stretch. Please find a minimal example example, where I have used
exaggerated values for shrink and stretch to emphasize the issue. It
can be reproduced with both mtxrun --script plain and luatex with
luaotfload.sty.
I have already checked linebreak.c but add_to_widths looks innocuous and
properly checks the adjust_spacing parameter.
Cheers, Henri
---
%\input luaotfload.sty
\directlua{
fonts.expansions.setups.default.stretch = 2000
fonts.expansions.setups.default.shrink = 2000
}
\adjustspacing=1
\font\1="file:lmroman10-regular.otf:expansion=default"
\hsize=5em
\1 \input lorem
\bye
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