message: Pad out the right side of rows in scrollback with the background color
diff: @@ -10,6 +10,7 @@ import { Logger, getLogger, log } from "extraterm-logging";
  import { ratioToFraction } from "./RatioToFraction";
  import { LigatureMarker } from "./LigatureMarker";
  import { WebGLRendererRepository } from "extraterm-char-render-canvas/dist/WebGLRendererRepository";
  +import { PALETTE_BG_INDEX } from "extraterm-char-render-canvas/dist/WebGLCharRenderCanvas";
  const PROVISION_HEIGHT_FACTOR = 1.5;
  @@ -311,6 +312,7 @@ export class CanvasTextLayer implements TextLayer {
  if (terminalLine.width < grid.width) {
  for (let i = terminalLine.width; i < grid.width; i++) {
  grid.clearCell(i, canvasRow);
  + grid.setBgClutIndex(i, canvasRow, PALETTE_BG_INDEX);
  }
  }
  