build: add exception for missing MDC test (#22188)

Adds an exception for one missing test until #22187 is merged.

Author: crisbeto

scripts/check-mdc-tests-config.ts

@@ -140,6 +140,9 @@ export const config = {
           'element is inside an ngIf'
     ],
     'mdc-select': [
+      // TODO(crisbeto): remove this exception once #22187 lands.
+      'should float the label on focus if it has a placeholder',
+
       // These tests are excluded, because they're verifying the functionality that positions
       // the select panel over the trigger which isn't supported in the MDC select.
       'should set the width of the overlay based on a larger trigger width',

src/material-experimental/mdc-chips/chip-input.ts

@@ -25,7 +25,7 @@ import {MatChipTextControl} from './chip-text-control';
 
 /** Represents an input event on a `matChipInput`. */
 export interface MatChipInputEvent {
-  /** 
+  /**
    * The native `<input>` element that the event is being fired for.
    * @deprecated Use `MatChipInputEvent#chipInput.inputElement` instead.
    * @breaking-change 13.0.0 This property will be removed.
@@ -34,9 +34,9 @@ export interface MatChipInputEvent {
 
   /** The value of the input. */
   value: string;
-  
-  /** 
-   * Reference to the chip input that emitted the event. 
+
+  /**
+   * Reference to the chip input that emitted the event.
    * @breaking-change 13.0.0 This property will be made required.
    */
   chipInput?: MatChipInput;

src/material/chips/chip-input.ts

@@ -25,7 +25,7 @@ import {MatChipTextControl} from './chip-text-control';
 
 /** Represents an input event on a `matChipInput`. */
 export interface MatChipInputEvent {
-  /** 
+  /**
    * The native `<input>` element that the event is being fired for.
    * @deprecated Use `MatChipInputEvent#chipInput.inputElement` instead.
    * @breaking-change 13.0.0 This property will be removed.
@@ -34,9 +34,9 @@ export interface MatChipInputEvent {
 
   /** The value of the input. */
   value: string;
-  
-  /** 
-   * Reference to the chip input that emitted the event. 
+
+  /**
+   * Reference to the chip input that emitted the event.
    * @breaking-change 13.0.0 This property will be made required.
    */
   chipInput?: MatChipInput;