1. Removed logic to blend selection with background with 0.3 opacity from ColorManager to a function in color namespace.

2. Changed the DomRenderer and CanvasRenderer where the function defined in color namespace is called.

src/browser/renderer/dom/DomRenderer.ts

@@ -53,7 +53,7 @@ export class DomRenderer extends Disposable implements IRenderer {
     @IBufferService private readonly _bufferService: IBufferService
   ) {
     super();
-
+    color.blendSelectionWithBgWithOpacity(this._colors);
     this._rowContainer = document.createElement('div');
     this._rowContainer.classList.add(ROW_CONTAINER_CLASS);
     this._rowContainer.style.lineHeight = 'normal';