get it to sort of work

src/browser/Terminal.ts

@@ -993,12 +993,15 @@ export class Terminal extends CoreTerminal implements ITerminal {
     return this.buffer.markers;
   }
 
-  public addMarker(cursorYOffset: number): IMarker | undefined {
+  public addMarker(cursorYOffset: number, row?: number): IMarker | undefined {
     // Disallow markers on the alt buffer
     if (this.buffer !== this.buffers.normal) {
       return;
     }
-
+    if (row) {
+      console.log(row);
+      return this.buffer.addMarker(row + 1);
+    }
     return this.buffer.addMarker(this.buffer.ybase + this.buffer.y + cursorYOffset);
   }
 

src/browser/Types.d.ts

@@ -60,7 +60,7 @@ export interface IPublicTerminal extends IDisposable {
   registerLinkProvider(linkProvider: ILinkProvider): IDisposable;
   registerCharacterJoiner(handler: (text: string) => [number, number][]): number;
   deregisterCharacterJoiner(joinerId: number): void;
-  addMarker(cursorYOffset: number): IMarker | undefined;
+  addMarker(cursorYOffset: number, col?: number, row?: number): IMarker | undefined;
   registerDecoration(decorationOptions: IDecorationOptions): IDecoration | undefined;
   hasSelection(): boolean;
   getSelection(): string;

src/browser/public/Terminal.ts

@@ -166,10 +166,13 @@ export class Terminal implements ITerminalApi {
     this._checkProposedApi();
     this._core.deregisterCharacterJoiner(joinerId);
   }
-  public registerMarker(cursorYOffset: number = 0): IMarker | undefined {
+  public registerMarker(cursorYOffset: number = 0, row?: number): IMarker | undefined {
     this._checkProposedApi();
     this._verifyIntegers(cursorYOffset);
-    return this._core.addMarker(cursorYOffset);
+    if (row) {
+      this._verifyPositiveIntegers(row);
+    }
+    return this._core.addMarker(cursorYOffset, row);
   }
   public registerDecoration(decorationOptions: IDecorationOptions): IDecoration | undefined {
     this._checkProposedApi();