Save cursor and restore more modes

Fixes #1526

src/common/buffer/Buffer.ts

@@ -38,6 +38,10 @@ export class Buffer implements IBuffer {
   public savedX: number = 0;
   public savedCurAttrData = DEFAULT_ATTR_DATA.clone();
   public savedCharset: ICharset | undefined = DEFAULT_CHARSET;
+  public savedCharsets: (ICharset | undefined)[] = [];
+  public savedGlevel: number = 0;
+  public savedOriginMode: boolean = false;
+  public savedWraparoundMode: boolean = true;
   public markers: Marker[] = [];
   private _nullCell: ICellData = CellData.fromCharData([0, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]);
   private _whitespaceCell: ICellData = CellData.fromCharData([0, WHITESPACE_CELL_CHAR, WHITESPACE_CELL_WIDTH, WHITESPACE_CELL_CODE]);

src/common/buffer/Types.ts

@@ -22,6 +22,10 @@ export interface IBuffer {
   savedY: number;
   savedX: number;
   savedCharset: ICharset | undefined;
+  savedCharsets: (ICharset | undefined)[];
+  savedGlevel: number;
+  savedOriginMode: boolean;
+  savedWraparoundMode: boolean;
   savedCurAttrData: IAttributeData;
   isCursorInViewport: boolean;
   markers: IMarker[];