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Index: source/texk/web2c/luatexdir/tex/mlist.w
===================================================================
--- source/texk/web2c/luatexdir/tex/mlist.w (revision 4448)
+++ source/texk/web2c/luatexdir/tex/mlist.w (revision 4449)
@@ -1798,7 +1798,17 @@
theta = fraction_rule(cur_style);
y = var_delimiter(left_delimiter(q), cur_size,
height(x) + depth(x) + clr + theta, NULL, cur_style);
- theta = height(y);
+ /* If |y| is a composite then set |theta| to the height of its top
+ character, else set it to the height of |y|. */
+ if (list_ptr(y) != null
+ && type(list_ptr(y)) == hlist_node
+ && list_ptr(list_ptr(y)) != null
+ && type(list_ptr(list_ptr(y))) == glyph_node) { /* and it should be */
+ theta = char_height(font(list_ptr(list_ptr(y))),
+ character(list_ptr(list_ptr(y))));
+ } else {
+ theta = height(y);
+ }
} else {
y = var_delimiter(left_delimiter(q), cur_size,
height(x) + depth(x) + clr + theta, NULL, cur_style);
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