Allow to disable fast scrolling

demo/client.ts

@@ -228,7 +228,7 @@ function initOptions(term: TerminalType): void {
     bellSound: null,
     bellStyle: ['none', 'sound'],
     cursorStyle: ['block', 'underline', 'bar'],
-    fastScrollModifier: ['alt', 'ctrl', 'shift'],
+    fastScrollModifier: ['alt', 'ctrl', 'shift', undefined],
     fontFamily: null,
     fontWeight: ['normal', 'bold', '100', '200', '300', '400', '500', '600', '700', '800', '900'],
     fontWeightBold: ['normal', 'bold', '100', '200', '300', '400', '500', '600', '700', '800', '900'],

src/common/services/Services.ts

@@ -180,7 +180,7 @@ export interface ITerminalOptions {
   cursorStyle: 'block' | 'underline' | 'bar';
   disableStdin: boolean;
   drawBoldTextInBrightColors: boolean;
-  fastScrollModifier: 'alt' | 'ctrl' | 'shift';
+  fastScrollModifier: 'alt' | 'ctrl' | 'shift' | undefined;
   fastScrollSensitivity: number;
   fontSize: number;
   fontFamily: string;

typings/xterm.d.ts

@@ -85,7 +85,7 @@ declare module 'xterm' {
     /**
      * The modifier key hold to multiply scroll speed.
      */
-    fastScrollModifier?: 'alt' | 'ctrl' | 'shift';
+    fastScrollModifier?: 'alt' | 'ctrl' | 'shift' | undefined;
 
     /**
      * The scroll speed multiplier used for fast scrolling.