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。

Table.cpp

@@ -614,6 +614,40 @@ RECT Table::getManagedRepaintCoverageRect() const
 	return coverage;
 }
 
+RECT Table::getManagedRepaintPersistentCoverageRect() const
+{
+	// Table 当前仍按整表绘制保证正确性；分页按钮 Tooltip 属于临时浮层，
+	// 不能进入持久 coverage，否则可能污染外层兄弟控件快照。
+	RECT coverage = getBoundsRect();
+
+	if (pageNum && pageNum->IsVisible())
+	{
+		const RECT pageRect = pageNum->getManagedRepaintPersistentCoverageRect();
+		coverage.left = (std::min)(coverage.left, pageRect.left);
+		coverage.top = (std::min)(coverage.top, pageRect.top);
+		coverage.right = (std::max)(coverage.right, pageRect.right);
+		coverage.bottom = (std::max)(coverage.bottom, pageRect.bottom);
+	}
+	if (prevButton && prevButton->IsVisible())
+	{
+		const RECT prevRect = prevButton->getManagedRepaintPersistentCoverageRect();
+		coverage.left = (std::min)(coverage.left, prevRect.left);
+		coverage.top = (std::min)(coverage.top, prevRect.top);
+		coverage.right = (std::max)(coverage.right, prevRect.right);
+		coverage.bottom = (std::max)(coverage.bottom, prevRect.bottom);
+	}
+	if (nextButton && nextButton->IsVisible())
+	{
+		const RECT nextRect = nextButton->getManagedRepaintPersistentCoverageRect();
+		coverage.left = (std::min)(coverage.left, nextRect.left);
+		coverage.top = (std::min)(coverage.top, nextRect.top);
+		coverage.right = (std::max)(coverage.right, nextRect.right);
+		coverage.bottom = (std::max)(coverage.bottom, nextRect.bottom);
+	}
+
+	return coverage;
+}
+
 void Table::setHeaders(std::initializer_list<std::string> headers)
 {
 	this->headers.clear();