feat: add scrollContainerSelection option #320

Co-authored-by: Hufe921 <huangyunfeihufe@hotmail.com>

docs/en/guide/option.md

@@ -57,6 +57,7 @@ interface IEditorOption {
   maskMargin?: IMargin // Masking margins above the editor（for example: menu bar, bottom toolbar）。default: [0, 0, 0, 0]
   letterClass? string[] // Alphabet class supported by typesetting. default: a-zA-Z. Built-in alternative alphabet class: LETTER_CLASS
   contextMenuDisableKeys?: string[] // Disable context menu keys. default: []
+  scrollContainerSelector?: string // scroll container selector. default: document
   wordBreak?: WordBreak // Word and punctuation breaks: No punctuation in the first line of the BREAK_WORD &The word is not split, and the line is folded after BREAK_ALL full according to the width of the character. default: BREAK_WORD
   watermark?: IWatermark // Watermark{data:string; color?:string; opacity?:number; size?:number; font?:string;}
   control?: IControlOption // Control {placeholderColor?:string; bracketColor?:string; prefix?:string; postfix?:string;}