fix: character typesetting boundary error #1280

Author: Hufe921

src/editor/core/draw/Draw.ts

@@ -1795,9 +1795,9 @@ export class Draw {
               elementList,
               i
             )
-            // 单词宽度大于行可用宽度，无需折行
+            // 后面存在元素 && 单词宽度大于行可用宽度，无需折行
             const wordWidth = width * scale
-            if (wordWidth <= availableWidth) {
+            if (endElement && wordWidth <= availableWidth) {
               curRowWidth += wordWidth
               nextElement = endElement
             }

src/editor/core/draw/particle/TextParticle.ts

@@ -10,7 +10,7 @@ import { Draw } from '../Draw'
 
 export interface IMeasureWordResult {
   width: number
-  endElement: IElement
+  endElement: IElement | null
 }
 
 export class TextParticle {
@@ -56,7 +56,7 @@ export class TextParticle {
   ): IMeasureWordResult {
     const LETTER_REG = this.draw.getLetterReg()
     let width = 0
-    let endElement: IElement = elementList[curIndex]
+    let endElement: IElement | null = null
     let i = curIndex
     while (i < elementList.length) {
       const element = elementList[i]