tweak click handler

Author: adolgachev

src/material/chips/chip-row.ts

@@ -160,6 +160,10 @@ export class MatChipRow extends MatChip implements AfterViewInit {
 
   _handleClick(event: MouseEvent) {
     if (!this.disabled && this.editable && !this._isEditing && this._alreadyFocused) {
+      // Ensure click event not picked up unintentionally by other listeners, as
+      // once editing starts, the source element is detached from DOM.
+      event.preventDefault();
+      event.stopPropagation();
       this._startEditing(event);
     }
   }