Add quirks setting to control DECSET/DECRST 12

Fixes #5314

src/common/services/OptionsService.ts

@@ -53,7 +53,8 @@ export const DEFAULT_OPTIONS: Readonly<Required<ITerminalOptions>> = {
   convertEol: false,
   termName: 'xterm',
   cancelEvents: false,
-  overviewRuler: {}
+  overviewRuler: {},
+  quirks: {}
 };
 
 const FONT_WEIGHT_OPTIONS: Extract<FontWeight, string>[] = ['normal', 'bold', '100', '200', '300', '400', '500', '600', '700', '800', '900'];

src/common/services/Services.ts

@@ -262,6 +262,7 @@ export interface ITerminalOptions {
   windowOptions?: IWindowOptions;
   wordSeparator?: string;
   overviewRuler?: IOverviewRulerOptions;
+  quirks?: ITerminalQuirks;
   scrollOnEraseInDisplay?: boolean;
 
   [key: string]: any;
@@ -300,6 +301,10 @@ export interface ITheme {
   extendedAnsi?: string[];
 }
 
+export interface ITerminalQuirks {
+  allowSetCursorBlink?: boolean;
+}
+
 export const IOscLinkService = createDecorator<IOscLinkService>('OscLinkService');
 export interface IOscLinkService {
   serviceBrand: undefined;