Merge pull request #4165 from Tyriar/4164

Define all events and emitters consistently

src/common/buffer/BufferSet.ts

@@ -19,8 +19,8 @@ export class BufferSet extends Disposable implements IBufferSet {
   private _alt!: Buffer;
   private _activeBuffer!: Buffer;
 
-  private _onBufferActivate = this.register(new EventEmitter<{activeBuffer: IBuffer, inactiveBuffer: IBuffer}>());
-  public get onBufferActivate(): IEvent<{activeBuffer: IBuffer, inactiveBuffer: IBuffer}> { return this._onBufferActivate.event; }
+  private readonly _onBufferActivate = this.register(new EventEmitter<{activeBuffer: IBuffer, inactiveBuffer: IBuffer}>());
+  public readonly onBufferActivate = this._onBufferActivate.event;
 
   /**
    * Create a new BufferSet for the given terminal.

src/common/buffer/Marker.ts

@@ -15,8 +15,8 @@ export class Marker extends Disposable implements IMarker {
 
   public get id(): number { return this._id; }
 
-  private _onDispose = new EventEmitter<void>();
-  public get onDispose(): IEvent<void> { return this._onDispose.event; }
+  private readonly _onDispose = new EventEmitter<void>();
+  public readonly onDispose = this._onDispose.event;
 
   constructor(
     public line: number