fix: 使用TextPaint副本避免修改共享paint影响绘制线程

app/src/main/java/io/legado/app/ui/book/read/page/provider/TextChapterLayout.kt

@@ -1365,7 +1365,7 @@ class TextChapterLayout(
 
     /**
      * 对有自定义字体的高亮字符重新测量宽度，确保排版和绘制使用同一套字体度量。
-     * 不使用 getTextWidthsCompat 避免对子串错误添加 letterSpacing。
+     * 使用 textPaint 副本测量，避免修改共享 paint 的 typeface 影响绘制线程。
      */
     private fun remeasureWithHighlightFonts(
         text: String,
@@ -1373,8 +1373,7 @@ class TextChapterLayout(
         textPaint: TextPaint,
         widthsArray: FloatArray
     ) {
-        val originalTypeface = textPaint.typeface
+        val measurePaint = TextPaint(textPaint)
-        try {
         var i = 0
         while (i < text.length) {
             val fontPath = charStyles[i]?.fontPath.orEmpty()
@@ -1385,15 +1384,12 @@ class TextChapterLayout(
             while (i < text.length && charStyles[i]?.fontPath.orEmpty() == fontPath) i++
             val segEnd = i
             val typeface = TextColumn.getTypeface(fontPath) ?: continue
-                textPaint.typeface = typeface
+            measurePaint.typeface = typeface
             val segLen = segEnd - segStart
             val segWidths = FloatArray(segLen)
-                textPaint.getTextWidths(text, segStart, segEnd, segWidths)
+            measurePaint.getTextWidths(text, segStart, segEnd, segWidths)
             segWidths.copyInto(widthsArray, segStart)
         }
-        } finally {
-            textPaint.typeface = originalTypeface
-        }
     }
 
     /**