fix: 高亮规则排版

app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt

@@ -2774,6 +2774,7 @@ class ReadBookViewModel(
                 }
             }
             is ConfigUpdate.DoubleHorizontalPage -> {
+                ReadConfig.doubleHorizontalPage = update.value
                 viewModelScope.launch {
                     readSettingsRepository.setDoubleHorizontalPage(update.value)
                 }

app/src/main/java/io/legado/app/ui/book/read/page/entities/column/TextColumn.kt

@@ -75,12 +75,14 @@ data class TextColumn(
         val needRestoreTypeface = customTypeface != null
         if (needRestoreSize) {
             val originalSize = textPaint.textSize
+            val originalTypeface = if (needRestoreTypeface) textPaint.typeface else null
             textPaint.textSize = textLine.titleTextSize!!
             if (needRestoreColor) textPaint.color = drawColor
             if (needRestoreTypeface) textPaint.typeface = customTypeface
             val y = textLine.lineBase - textLine.lineTop
             drawText(canvas, y, textPaint)
             textPaint.textSize = originalSize
+            if (needRestoreTypeface) textPaint.typeface = originalTypeface
         } else if (needRestoreColor || needRestoreTypeface) {
             val originalColor = textPaint.color
             val originalTypeface = textPaint.typeface

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

@@ -1365,6 +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。
      */
     private fun remeasureWithHighlightFonts(
         text: String,
@@ -1373,6 +1374,7 @@ class TextChapterLayout(
         widthsArray: FloatArray
     ) {
         val originalTypeface = textPaint.typeface
+        try {
             var i = 0
             while (i < text.length) {
                 val fontPath = charStyles[i]?.fontPath.orEmpty()
@@ -1384,13 +1386,15 @@ class TextChapterLayout(
                 val segEnd = i
                 val typeface = TextColumn.getTypeface(fontPath) ?: continue
                 textPaint.typeface = typeface
-            val segment = text.substring(segStart, segEnd)
+                val segLen = segEnd - segStart
-            val segWidths = FloatArray(segEnd - segStart)
+                val segWidths = FloatArray(segLen)
-            textPaint.getTextWidthsCompat(segment, segWidths)
+                textPaint.getTextWidths(text, segStart, segEnd, segWidths)
                 segWidths.copyInto(widthsArray, segStart)
             }
+        } finally {
             textPaint.typeface = originalTypeface
         }
+    }
 
     /**
      * 对文本应用高亮规则，返回每字符的样式数组。无匹配时返回 null。