md-tabs: scroll to active tab on init shouldn't be smooth behaviour

[kkachniarz220]

What is affected?

Component

Description

Scrolling to active tab on component init should be immediate, now it is smooth.

In addition there is weird behaviour with playground:

screen-capture.9.webm

Reproduction

lit.dev

Workaround

I have not found a reproduction

Is this a regression?

No or unsure. This never worked, or I haven't tried before.

Affected versions

1.3.0

Browser/OS/Node environment

Chrome 121.0.6167.187
Windows 11

[asyncLiz]

Looks like the boolean logic was flipping and we were smooth scrolling on init and instant scrolling on arrow key navigation, whoops!

I'm fixing this in #5499. It'll also fix setting scroll-behavior: instant on the tabs to turn off the default smooth scrolling.