feat(material/tabs): add stretchTabs to MatTabsConfig (#26644)

* feat: add `stretchTabs` to `MatTabsConfig`

* Update tab-group.ts

* change default to `true` as per @crisbeto 's request

* yarn ng-dev format files src/material/tabs/tab-config.ts src/material/tabs/tab-group.ts

* feat(material/tabs): update api guard

Author: joelkesler

src/material/tabs/tab-config.ts

@@ -36,6 +36,9 @@ export interface MatTabsConfig {
    * like iframes and videos from reloading next time it comes back into the view.
    */
   preserveContent?: boolean;
+
+  /** Whether tabs should be stretched to fill the header. */
+  stretchTabs?: boolean;
 }
 
 /** Injection token that can be used to provide the default options the tabs module. */

src/material/tabs/tab-group.ts

@@ -566,6 +566,8 @@ export class MatTabGroup extends _MatTabGroupBase {
       defaultConfig && defaultConfig.fitInkBarToContent != null
         ? defaultConfig.fitInkBarToContent
         : false;
+    this.stretchTabs =
+      defaultConfig && defaultConfig.stretchTabs != null ? defaultConfig.stretchTabs : true;
   }
 }
 

tools/public_api_guard/material/tabs.md

@@ -568,6 +568,7 @@ export interface MatTabsConfig {
     dynamicHeight?: boolean;
     fitInkBarToContent?: boolean;
     preserveContent?: boolean;
+    stretchTabs?: boolean;
 }
 
 // @public (undocumented)