[Bug Report] v-tabs bar missing offset on medium(?) viewports to indicate that scrolling is possible

[Bbansjkl]

Versions and Environment

Vuetify: 1.5.9
Vue: 2.6.10
Browsers: Firefox 66.0
OS: Windows 7

Steps to reproduce

1. Create a v-tabs component with more tabs than fit into it
2. Lower viewport size to <=1263px, e.g. by resizing the window or rendering within an iframe

Expected Behavior

Offset is shown on the left-hand size

Actual Behavior

Offset is not displayed

Reproduction Link

https://codepen.io/anon/pen/jRrbYy

Other comments

Also happens in 2.0.0-alpha.12

Google Material specs (ctrl+f -> "Placement"->scroll down) say that "Do: On mobile and desktop, offset the first tab on the left to signal that tabs are scrollable." This is not the case on devices with a medium(?) viewport.
On larger viewports this is kinda supported, since the left arrow is not displayed while there are no items on the left, but smaller viewports don't show arrows unless the "show-arrows"-prop is provided.

Kinda off-topic: On Desktop the arrows vanish too, which makes scrolling hard on smaller viewports (e.g. when the page is rendered within an iframe on a small resolution, or when the browser window is not maximized). The only way to scroll then is to repeatedly click the last item. This was first discussed in #1789, which was closed in favor of #2530, resulting in the PR #2838, which supposedly made arrows show up on all viewport sizes - was this removed again or is the arrows vanishing on viewports with less than 1264px width a bug and should be covered in a new issue?

[johnleider]

The last part should be in a new issue please/ty :)

[johnleider]

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