fix:optimize selection operation

src/editor/core/position/Position.ts

@@ -148,8 +148,8 @@ export class Position {
         const isHead = x < this.options.margins[3]
         // 是否在头部
         if (isHead) {
-          const headIndex = positionList.findIndex(p => p.rowNo === firstLetterList[j].rowNo)
-          curPositionIndex = ~headIndex ? headIndex : index
+          const headIndex = positionList.findIndex(p => p.pageNo === curPageNo && p.rowNo === firstLetterList[j].rowNo)
+          curPositionIndex = ~headIndex ? headIndex - 1 : index
         } else {
           curPositionIndex = index
         }

src/editor/utils/clipboard.ts

@@ -39,5 +39,5 @@ export function writeTextByElementList(elementList: IElement[]) {
   }
   pickTextFromElement(elementList)
   if (!text) return
-  writeText(text)
+  writeText(text.replace(new RegExp(`^${ZERO}`), ''))
 }