fix: paste list element boundary error #487

src/editor/core/draw/Draw.ts

@@ -581,6 +581,18 @@ export class Draw {
       }
       this.spliceElementList(elementList, start, 0, ...payload)
       curIndex = startIndex + payload.length
+      // 列表前如有换行符则删除-因为列表内已存在
+      const preElement = elementList[start - 1]
+      if (
+        payload[0].listId &&
+        preElement &&
+        !preElement.listId &&
+        preElement?.value === ZERO &&
+        (!preElement.type || preElement.type === ElementType.TEXT)
+      ) {
+        elementList.splice(startIndex, 1)
+        curIndex -= 1
+      }
     }
     if (~curIndex) {
       this.range.setRange(curIndex, curIndex)

src/editor/core/event/handlers/keydown/index.ts

@@ -33,9 +33,16 @@ export function keydown(evt: KeyboardEvent, host: CanvasEvent) {
       curIndex = control.keydown(evt)
     } else {
       // 判断是否允许删除
-      if (isCollapsed && elementList[index].value === ZERO && index === 0) {
-        evt.preventDefault()
-        return
+      if (isCollapsed && index === 0) {
+        const firstElement = elementList[index]
+        if (firstElement.value === ZERO) {
+          // 取消首字符列表设置
+          if (firstElement.listId) {
+            draw.getListParticle().unsetList()
+          }
+          evt.preventDefault()
+          return
+        }
       }
       //  清空当前行对齐方式
       const startElement = elementList[startIndex]