feat: cursor following page scrolling #229

docs/en/guide/option.md

@@ -53,6 +53,7 @@ interface IEditorOption {
   inactiveAlpha?: number // When the body content is out of focus, transparency. default: 0.6
   historyMaxRecordCount: number // History (undo redo) maximum number of records. default: 100
   printPixelRatio: number // Print the pixel ratio (larger values are clearer, but larger sizes). default: 3
+  maskMargin: IMargin // Masking margins above the editor（for example: menu bar, bottom toolbar）。default: [0, 0, 0, 0]
   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;}