Long pressing a button on mobile causes neighbouring text to be selected

This can also be observed on the official page of the button component. Since the button has user-select: none, long pressing it on mobile does not select it's inner text, but instead starts selecting the next "user-selectable" text. This has been observed on iOS only, other devices unknown, maybe someone could confirm.

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

Long pressing a button on mobile selects the neighbouring text.

Expected Behavior 🤔

Long pressing a button on mobile does not select any text at all.

Steps to Reproduce 🕹

Steps:

1. Go to the button documentation page on a mobile device: https://material-ui.com/components/buttons/
2. Long press one of the button examples
3. Observe the next selectable text is selected

Context 🔦

I was trying to detect long presses on a button and although it works, it is annoying to see that some text is being selected elsewhere.

Your Environment 🌎

Material UI's website on iOS 14.4.2 Safari/Chrome/Firefox

Start by reproducing the issue on the official button component page at https://material-ui.com/components/buttons/ using the listed iOS browsers. Confirm that long-pressing a button selects neighbouring text, then verify that the completed fix prevents any text selection while preserving the button's long-press behavior.