Hello,
I think that displacement of a the of a math display
is missing when \leqno is used in RTL paragraph.
I attached a patch. Here is a simple test code (it requires the cmr10 font):
\catcode`\{=1\catcode`\}=2\catcode`\$=3
\directlua{tex.enableprimitives("",{"pardirection", "textdirection",
"Umathquad"})}
\tracingoutput=1\tracingonline=1
\showboxbreadth 16384 \showboxdepth 16384
\font\tenrm=cmr10
\textfont0=\tenrm
\hsize=345pt\vsize=550pt\parfillskip=0.0pt plus 1.0fil
\parindent=15pt\parskip=0pt plus1pt
\Umathquad\textstyle=10pt
\pardirection=1\textdirection=1
$$1 \leqno(1)$$
\end
Udi
diff --git a/source/texk/web2c/luatexdir/tex/texmath.c b/source/texk/web2c/luatexdir/tex/texmath.c
index 8b6138e7c..32c066daf 100644
--- a/source/texk/web2c/luatexdir/tex/texmath.c
+++ b/source/texk/web2c/luatexdir/tex/texmath.c
@@ -2590,11 +2590,16 @@ static void finish_displayed_math(boolean l, pointer eqno_box, pointer p)
if (swap_dir) {
if (math_direction_par==dir_TLT) {
/*tex TRT + TLT + \leqno: (swap_dir=true, math_direction_par=TLT, l=false) */
+ s = new_kern(d);
+ try_couple_nodes(s,eq_box);
+ try_couple_nodes(eq_box,r);
+ try_couple_nodes(r,eqno_box);
+ eq_box = s;
} else {
/*tex TLT + TRT + \leqno: (swap_dir=true, math_direction_par=TRT, l=false) */
+ try_couple_nodes(eq_box,r);
+ try_couple_nodes(r,eqno_box);
}
- try_couple_nodes(eq_box,r);
- try_couple_nodes(r,eqno_box);
} else {
if (math_direction_par==dir_TLT) {
/*tex TLT + TLT + \eqno: (swap_dir=false, math_direction_par=TLT, l=false) */
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