Fix rendering glitch of Popover arrow on low-dpi displays

[atmelmicro]

Because of rendering quirks sometimes a line can appear between the popover and arrow

(more visible on low dpi displays)

This pr fixes that by moving the arrow 1px down

[adamkudrna]

Thank you for the fix! I'd like to ask for a few minor adjustments to improve code readability and keep the existing flexibility (rem units).

[adamkudrna]

The PR name could be like "Fix rendering glitch of Popover arrow on low-dpi displays". There is no intentional line so it cannot be removed… 🙂

[adamkudrna]

OK, this took me some time to figure out, but I think I found the right calculations for what we need. You can test it with various values, for example 2 px gap and 8 px overlap or whatsoever.

[adamkudrna]

It works! 🎉

[atmelmicro]

Hey, the build failing because of the bundle being too big. Is it safe to merge?

[mbohal]

@atmelmicro

Please do increase the allowed size:

Here, as well as in our other codebases, we do not have a strict size increase process. We use the limit as a general guideline to prevent the size from exploding beyond reason as a result of bad development decision or a an error.

So if you, as the change author, consider the size increase justified, then feel free to increase the limit. The limit change will be reviewed during the CR same as any other change.

The size increase in this PR is minimal and is fine by me.