fix: boundary error when deleting elements backwards #606

src/editor/core/draw/Draw.ts

@@ -682,7 +682,7 @@ export class Draw {
       if (!this.control.getActiveControl()) {
         let deleteIndex = endIndex - 1
         while (deleteIndex >= start) {
-          if (elementList[deleteIndex].control?.deletable !== false) {
+          if (elementList[deleteIndex]?.control?.deletable !== false) {
             elementList.splice(deleteIndex, 1)
           }
           deleteIndex--

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

@@ -26,6 +26,7 @@ export function del(evt: KeyboardEvent, host: CanvasEvent) {
     if (!isCollapsed) {
       draw.spliceElementList(elementList, startIndex + 1, endIndex - startIndex)
     } else {
+      if (!elementList[index + 1]) return
       draw.spliceElementList(elementList, index + 1, 1)
     }
     curIndex = isCollapsed ? index : startIndex