fix(material/chips): unable to add space when editing chip (#26564)

Fixes that the default action of the spacebar was being prevented while the chip is in its editing state, not allowing users to enter whitespace.

(cherry picked from commit 1186c80)

Author: crisbeto

src/material/chips/chip-action.ts

@@ -85,6 +85,7 @@ export class MatChipAction extends _MatChipActionMixinBase implements HasTabInde
       _handlePrimaryActionInteraction(): void;
       remove(): void;
       disabled: boolean;
+      _isEditing?: boolean;
     },
   ) {
     super();
@@ -110,7 +111,8 @@ export class MatChipAction extends _MatChipActionMixinBase implements HasTabInde
       (event.keyCode === ENTER || event.keyCode === SPACE) &&
       !this.disabled &&
       this.isInteractive &&
-      this._isPrimary
+      this._isPrimary &&
+      !this._parentChip._isEditing
     ) {
       event.preventDefault();
       this._parentChip._handlePrimaryActionInteraction();

src/material/chips/chip-row.spec.ts

@@ -1,5 +1,5 @@
 import {Directionality} from '@angular/cdk/bidi';
-import {BACKSPACE, DELETE, ENTER} from '@angular/cdk/keycodes';
+import {BACKSPACE, DELETE, ENTER, SPACE} from '@angular/cdk/keycodes';
 import {
   createKeyboardEvent,
   dispatchEvent,
@@ -331,6 +331,14 @@ describe('MDC-based Row Chips', () => {
         flush();
         expect(document.activeElement).not.toBe(primaryAction);
       }));
+
+      it('should not prevent SPACE events when editing', fakeAsync(() => {
+        const event = dispatchKeyboardEvent(getEditInput(), 'keydown', SPACE);
+        fixture.detectChanges();
+        flush();
+
+        expect(event.defaultPrevented).toBe(false);
+      }));
     });
 
     describe('a11y', () => {