MatSlider: text selection cursor shows while sliding

[nigel5]

What is the expected behavior?

When sliding the mat-slider, the cursor state should be "dragging"

What is the current behavior?

The cursor state is "text"

What are the steps to reproduce?

Visit the slider example and drag the slider left/right.

Observe text cursor instead of dragging cursor.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material 7.20 (the version on the example website)
macOS 10.14.2 Mojave
Safari 12.0.2

Is there anything else we should know?

No

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