Fix compression of punctuation marks at line start of end (#3744)

crates/typst/src/layout/inline/shaping.rs

@@ -189,14 +189,12 @@ impl ShapedGlyph {
         self.x_offset -= amount;
         self.x_advance -= amount;
         self.adjustability.shrinkability.0 -= amount;
-        self.adjustability.stretchability.0 += amount;
     }
 
     /// Shrink the width of glyph on the right side.
     pub fn shrink_right(&mut self, amount: Em) {
         self.x_advance -= amount;
         self.adjustability.shrinkability.1 -= amount;
-        self.adjustability.stretchability.1 += amount;
     }
 }
 

tests/typ/layout/par-justify-cjk.typ

@@ -49,3 +49,16 @@
 
 #set text(lang: "zh", region: "hk", font: "Noto Serif CJK TC")
 孔雀最早见于《山海经》中的《海内经》：「有孔雀。」东汉杨孚著《异物志》记载，岭南：「孔雀，其大如大雁而足高，毛皆有斑纹彩，捕而蓄之，拍手即舞。」
+
+---
+// Test punctuation marks adjustment in justified paragraph.
+
+// The test case includes the following scenarios:
+// - Compression of punctuation marks at line start or line end
+// - Adjustment of adjacent punctuation marks
+
+#set page(width: 110pt + 10pt, margin: (x: 5pt))
+#set text(lang: "zh", font: "Noto Serif CJK SC")
+#set par(justify: true)
+
+标注在字间的标点符号（乙式括号省略号以外）通常占一个汉字宽度，使其易于识别、适合配置及排版，有些排版风格完全不对标点宽度进行任何调整。但是为了让文字体裁更加紧凑易读，，，以及执行3.1.4 行首行尾禁则时，就需要对标点符号的宽度进行调整。是否调整取决于……