Merge pull request #3082 from Tyriar/3080_selection_canvas

Fix last/first line of selection sometimes not drawing

src/browser/renderer/SelectionRenderLayer.ts

@@ -75,6 +75,7 @@ export class SelectionRenderLayer extends BaseRenderLayer {
 
     // No need to draw the selection
     if (viewportCappedStartRow >= this._bufferService.rows || viewportCappedEndRow < 0) {
+      this._state.ydisp = this._bufferService.buffer.ydisp;
       return;
     }