Remove ScrollSource

This isn't used anymore, it was used earlier to workaround recursion between
the viewport and the terminal objects

src/common/CoreTerminal.ts

@@ -27,7 +27,7 @@ import { InstantiationService } from 'common/services/InstantiationService';
 import { LogService } from 'common/services/LogService';
 import { BufferService, MINIMUM_COLS, MINIMUM_ROWS } from 'common/services/BufferService';
 import { OptionsService } from 'common/services/OptionsService';
-import { IDisposable, IAttributeData, ICoreTerminal, IScrollEvent, ScrollSource } from 'common/Types';
+import { IDisposable, IAttributeData, ICoreTerminal, IScrollEvent } from 'common/Types';
 import { CoreService } from 'common/services/CoreService';
 import { EventEmitter, IEvent, forwardEvent } from 'common/EventEmitter';
 import { CoreMouseService } from 'common/services/CoreMouseService';
@@ -134,11 +134,11 @@ export abstract class CoreTerminal extends Disposable implements ICoreTerminal {
     this.register(this.coreService.onUserInput(() =>  this._writeBuffer.handleUserInput()));
     this.register(this.optionsService.onMultipleOptionChange(['windowsMode', 'windowsPty'], () => this._handleWindowsPtyOptionChange()));
     this.register(this._bufferService.onScroll(event => {
-      this._onScroll.fire({ position: this._bufferService.buffer.ydisp, source: ScrollSource.TERMINAL });
+      this._onScroll.fire({ position: this._bufferService.buffer.ydisp });
       this._inputHandler.markRangeDirty(this._bufferService.buffer.scrollTop, this._bufferService.buffer.scrollBottom);
     }));
     this.register(this._inputHandler.onScroll(event => {
-      this._onScroll.fire({ position: this._bufferService.buffer.ydisp, source: ScrollSource.TERMINAL });
+      this._onScroll.fire({ position: this._bufferService.buffer.ydisp });
       this._inputHandler.markRangeDirty(this._bufferService.buffer.scrollTop, this._bufferService.buffer.scrollBottom);
     }));
 
@@ -198,10 +198,9 @@ export abstract class CoreTerminal extends Disposable implements ICoreTerminal {
    * @param suppressScrollEvent Don't emit the scroll event as scrollLines. This is used to avoid
    * unwanted events being handled by the viewport when the event was triggered from the viewport
    * originally.
-   * @param source Which component the event came from.
    */
-  public scrollLines(disp: number, suppressScrollEvent?: boolean, source?: ScrollSource): void {
-    this._bufferService.scrollLines(disp, suppressScrollEvent, source);
+  public scrollLines(disp: number, suppressScrollEvent?: boolean): void {
+    this._bufferService.scrollLines(disp, suppressScrollEvent);
   }
 
   public scrollPages(pageCount: number): void {

src/common/Types.ts

@@ -60,12 +60,6 @@ export interface IKeyboardEvent {
 
 export interface IScrollEvent {
   position: number;
-  source: ScrollSource;
-}
-
-export const enum ScrollSource {
-  TERMINAL,
-  VIEWPORT,
 }
 
 export interface ICircularList<T> {

src/common/services/BufferService.ts

@@ -5,7 +5,7 @@
 
 import { EventEmitter } from 'common/EventEmitter';
 import { Disposable } from 'common/Lifecycle';
-import { IAttributeData, IBufferLine, ScrollSource } from 'common/Types';
+import { IAttributeData, IBufferLine } from 'common/Types';
 import { BufferSet } from 'common/buffer/BufferSet';
 import { IBuffer, IBufferSet } from 'common/buffer/Types';
 import { IBufferService, IOptionsService } from 'common/services/Services';
@@ -125,7 +125,7 @@ export class BufferService extends Disposable implements IBufferService {
    * to avoid unwanted events being handled by the viewport when the event was triggered from the
    * viewport originally.
    */
-  public scrollLines(disp: number, suppressScrollEvent?: boolean, source?: ScrollSource): void {
+  public scrollLines(disp: number, suppressScrollEvent?: boolean): void {
     const buffer = this.buffer;
     if (disp < 0) {
       if (buffer.ydisp === 0) {

src/common/services/Services.ts

@@ -3,11 +3,11 @@
  * @license MIT
  */
 
+import { IDecoration, IDecorationOptions, ILinkHandler, ILogger, IWindowsPty } from '@xterm/xterm';
 import { IEvent, IEventEmitter } from 'common/EventEmitter';
+import { CoreMouseEncoding, CoreMouseEventType, CursorInactiveStyle, CursorStyle, IAttributeData, ICharset, IColor, ICoreMouseEvent, ICoreMouseProtocol, IDecPrivateModes, IDisposable, IModes, IOscLinkData, IWindowOptions } from 'common/Types';
 import { IBuffer, IBufferSet } from 'common/buffer/Types';
-import { IDecPrivateModes, ICoreMouseEvent, CoreMouseEncoding, ICoreMouseProtocol, CoreMouseEventType, ICharset, IWindowOptions, IModes, IAttributeData, ScrollSource, IDisposable, IColor, CursorStyle, CursorInactiveStyle, IOscLinkData } from 'common/Types';
 import { createDecorator } from 'common/services/ServiceRegistry';
-import { IDecorationOptions, IDecoration, ILinkHandler, IWindowsPty, ILogger } from '@xterm/xterm';
 
 export const IBufferService = createDecorator<IBufferService>('BufferService');
 export interface IBufferService {
@@ -21,7 +21,7 @@ export interface IBufferService {
   onResize: IEvent<{ cols: number, rows: number }>;
   onScroll: IEvent<number>;
   scroll(eraseAttr: IAttributeData, isWrapped?: boolean): void;
-  scrollLines(disp: number, suppressScrollEvent?: boolean, source?: ScrollSource): void;
+  scrollLines(disp: number, suppressScrollEvent?: boolean): void;
   resize(cols: number, rows: number): void;
   reset(): void;
 }