【fix】特定文档滚动时卡顿

PDF Office/PDF Master/Class/PDFWindowController/PDFListView/AppKitCategories/PDFListView+KMExtensions.swift

@@ -14,6 +14,9 @@ import Foundation
         if (self.length < 1) {
             return ""
         }
+        if bounds.size.width <= 0 {
+            return ""
+        }
         var tString = self
         var rect = tString.boundingRect(with: CGSizeMake(MAXFLOAT.cgFloat, MAXFLOAT.cgFloat), options: [.truncatesLastVisibleLine,.usesFontLeading,.usesLineFragmentOrigin], attributes: attributes, context: nil)
         if (rect.size.width > bounds.size.width) {