发布前托管重绘与布局封版收口

收口 Dialog/overlay 后鼠标状态同步、Tooltip 临时 coverage 与持久 coverage 拆分、跨 root 脏区补提交、TextBox/Button 绘制副作用修复，并补充 KEY6 回归用例和 BUG/Fix/Feature 开发记录。

TabControl.cpp

@@ -4,6 +4,12 @@
 
 namespace
 {
+	enum class SxTabOverlayRedrawMode
+	{
+		None,
+		RefreshSnapshot
+	};
+
 	bool SxTabRectsIntersect(const RECT& a, const RECT& b)
 	{
 		return a.left < b.right && a.right > b.left &&
@@ -473,7 +479,7 @@ int TabControl::indexOf(const std::string& tabText) const
 			return idx;
 	}
 
-	return idx;
+	return -1;
 }
 
 void TabControl::setDirty(bool dirty)
@@ -498,9 +504,11 @@ void TabControl::requestRepaint(Control* parent)
 
 	if (this == parent)
 	{
-		RECT coverage{};
-		bool hasCoverage = false;
-		auto commitTabUnit = [&](Control* unit, bool forceOverlayRedraw)
+		RECT paintCoverage{};
+		bool hasPaintCoverage = false;
+		RECT persistentCoverage{};
+		bool hasPersistentCoverage = false;
+		auto commitTabUnit = [&](Control* unit, SxTabOverlayRedrawMode overlayMode)
 			{
 				if (!unit || !unit->IsVisible())
 					return;
@@ -508,9 +516,9 @@ void TabControl::requestRepaint(Control* parent)
 				const bool directDirty = unit->isDirty();
 				const bool subtreeDirty = unit->hasManagedDirtySubtree();
 
-				if (forceOverlayRedraw)
+				if (overlayMode == SxTabOverlayRedrawMode::RefreshSnapshot)
 				{
-					// 下层单元已经写过像素，上层页签/页面作为 overlay 补画时，
+					// 下层单元的持久内容已经写过像素，上层页签/页面作为 overlay 补画时，
 					// 必须先丢掉旧快照，重新抓取当前背景后再画，否则会把旧背景再贴回来。
 					unit->invalidateBackgroundSnapshot();
 					unit->setDirty(true);
@@ -529,15 +537,26 @@ void TabControl::requestRepaint(Control* parent)
 					return;
 				}
 
-				const RECT rc = unit->getManagedRepaintCoverageRect();
-				if (!hasCoverage)
+				const RECT paintRect = unit->getManagedRepaintCoverageRect();
+				if (!hasPaintCoverage)
 				{
-					coverage = rc;
-					hasCoverage = true;
+					paintCoverage = paintRect;
+					hasPaintCoverage = true;
 				}
 				else
 				{
-					coverage = SxTabUnionRect(coverage, rc);
+					paintCoverage = SxTabUnionRect(paintCoverage, paintRect);
+				}
+
+				const RECT persistentRect = unit->getManagedRepaintPersistentCoverageRect();
+				if (!hasPersistentCoverage)
+				{
+					persistentCoverage = persistentRect;
+					hasPersistentCoverage = true;
+				}
+				else
+				{
+					persistentCoverage = SxTabUnionRect(persistentCoverage, persistentRect);
 				}
 			};
 
@@ -553,11 +572,14 @@ void TabControl::requestRepaint(Control* parent)
 
 			if (page->hasManagedDirtySubtree())
 			{
-				commitTabUnit(page, false);
+				commitTabUnit(page, SxTabOverlayRedrawMode::None);
 			}
-			else if (hasCoverage && SxTabRectsIntersect(page->getManagedRepaintCoverageRect(), coverage))
+			else if (hasPaintCoverage && SxTabRectsIntersect(page->getManagedRepaintCoverageRect(), paintCoverage))
 			{
-				commitTabUnit(page, true);
+				const bool persistentHit = hasPersistentCoverage &&
+					SxTabRectsIntersect(page->getManagedRepaintPersistentCoverageRect(), persistentCoverage);
+				if (persistentHit)
+					commitTabUnit(page, SxTabOverlayRedrawMode::RefreshSnapshot);
 			}
 		}
 
@@ -569,11 +591,14 @@ void TabControl::requestRepaint(Control* parent)
 
 			if (button->hasManagedDirtySubtree())
 			{
-				commitTabUnit(button, false);
+				commitTabUnit(button, SxTabOverlayRedrawMode::None);
 			}
-			else if (hasCoverage && SxTabRectsIntersect(button->getManagedRepaintCoverageRect(), coverage))
+			else if (hasPaintCoverage && SxTabRectsIntersect(button->getManagedRepaintCoverageRect(), paintCoverage))
 			{
-				commitTabUnit(button, true);
+				const bool persistentHit = hasPersistentCoverage &&
+					SxTabRectsIntersect(button->getManagedRepaintPersistentCoverageRect(), persistentCoverage);
+				if (persistentHit)
+					commitTabUnit(button, SxTabOverlayRedrawMode::RefreshSnapshot);
 			}
 		}
 		return;
@@ -612,6 +637,21 @@ RECT TabControl::getManagedRepaintCoverageRect() const
 	return coverage;
 }
 
+RECT TabControl::getManagedRepaintPersistentCoverageRect() const
+{
+	// 持久 coverage 排除页签按钮 Tooltip 等临时浮层，
+	// 用于判断上层页签/页面补画时是否允许刷新背景快照。
+	RECT coverage = getBoundsRect();
+	for (const auto& control : controls)
+	{
+		if (control.first->IsVisible())
+			coverage = SxTabUnionRect(coverage, control.first->getManagedRepaintPersistentCoverageRect());
+		if (control.second->IsVisible())
+			coverage = SxTabUnionRect(coverage, control.second->getManagedRepaintPersistentCoverageRect());
+	}
+	return coverage;
+}
+
 bool TabControl::canCommitManagedPartialRepaint() const
 {
 	// TabControl 只有在自己本体不脏且背景快照有效时，才允许只更新脏页签/脏页面。