【fix】【背景】预览窗口第一页不显示红色背景

PDF Office/PDF Master/Class/PDFTools/Background/New/View/KMAddBackgroundView.swift

@@ -478,6 +478,7 @@ class KMAddBackgroundView: KMBaseXibView, NSComboBoxDelegate {
         self.pdfView.document = document
         
         DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.1) {
+            self.pdfView.layoutDocumentView()
             self.isAllowReloadDocument = true
         }
     }