优化

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

@@ -200,7 +200,7 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
         }
         binding.swUnderline.setOnCheckedChangeListener { _, isChecked ->
             underline = isChecked
-            postEvent(EventBus.UP_CONFIG, arrayListOf(9, 11))
+            postEvent(EventBus.UP_CONFIG, arrayListOf(6, 9, 11))
         }
         binding.tvTextColor.setOnClickListener {
             ColorPickerDialog.newBuilder()

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

@@ -673,10 +673,9 @@ class ReadView(context: Context, attrs: AttributeSet) :
 
     fun submitRenderTask() {
         if (!AppConfig.optimizeRender) {
-            curPage.invalidateContentView()
-        } else {
-            curPage.submitRenderTask()
+            return
         }
+        curPage.submitRenderTask()
     }
 
     fun isLongScreenShot(): Boolean {