[Tabs] Pagination shown when tabs change but the tab label text does not

[timbell]

Reproduction

https://stackblitz.com/edit/mat-tab-pagination-problem?file=src/app/app.component.ts

Steps to reproduce:

1. 3 tabs are displayed with no pagination (tab group width is set to 600px)
2. Click on the New tabs button at least twice
3. Pagination is displayed
4. Clicking on the New tabs with different names button displays new tabs without any pagination

Expected Behavior

New tabs displayed without any pagination

Actual Behavior

Pagination show after new tabs with the same text created

Environment

• Angular: 8.2.2
• CDK/Material: 8.1.3
• Browser(s): Chrome, Firefox, Safari, Edge, IE
• Operating System (e.g. Windows, macOS, Ubuntu): Windows, Android, iOS

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