From 47fe2dc4501951c370a41b0e9d4942f3f3c187ec Mon Sep 17 00:00:00 2001
From: shenlei <shenlei@touchread.com>
Date: Mon, 6 Jul 2026 11:14:48 +0900
Subject: [PATCH] =?UTF-8?q?=E9=A1=B5=E8=A1=A8=E5=85=A8=E9=87=8F=E6=8E=A5?=
 =?UTF-8?q?=E7=AE=A1=E6=94=B9=E4=B8=BA=E6=8C=89=E5=AD=90=E9=9B=86=E8=A6=86?=
 =?UTF-8?q?=E7=9B=96=E5=88=A4=E5=AE=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

fullReplace 从"候选章节数 >= 当前章节数"改为"候选页表必须覆盖当前窗口
的全部章节",避免跳章后 partial map 数量达标但缺少远端已映射章节时,
全量替换丢弃这些条目导致总页数抖动。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 .../RDEPUBPageMapReconciliationCoordinator.swift         | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
index 03b85e8..c601bfe 100644
--- a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
+++ b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
@@ -164,6 +164,7 @@ final class RDEPUBPageMapReconciliationCoordinator {
         lastBuildableSpineIndex: Int
     ) -> RDEPUBPageMapTakeoverDecision {
         let candidateIndices = Set(candidatePageMap.entries.map { $0.spineIndex })
+        let currentIndices = Set(currentWindow.entries.map { $0.spineIndex })
         let currentEntries = currentWindow.entries.count
 
         if let currentSpineIndex {
@@ -189,8 +190,8 @@ final class RDEPUBPageMapReconciliationCoordinator {
             }
         }
 
-        let isComplete = candidateIndices.count >= currentEntries
-        if isComplete {
+        let coversCurrentWindow = currentIndices.isSubset(of: candidateIndices)
+        if coversCurrentWindow {
             RDEPUBBackgroundTrace.log(
                 "Reconciliation",
                 "evaluateFullPageMapTakeover: fullReplace — candidateChapters=\(candidateIndices.count) currentChapters=\(currentEntries) candidatePages=\(candidatePageMap.totalPages) currentPages=\(currentWindow.totalPages)"
@@ -198,6 +199,10 @@ final class RDEPUBPageMapReconciliationCoordinator {
             return .fullReplace(candidatePageMap)
         }
 
+        RDEPUBBackgroundTrace.log(
+            "Reconciliation",
+            "evaluateFullPageMapTakeover: keepCurrentWindow — candidate does not cover currentWindow candidateChapters=\(candidateIndices.count) currentChapters=\(currentEntries)"
+        )
         return .keepCurrentWindow
     }