External links overflow popup dialog

[Suprnova]

Describe the bug: External links will overflow out of its "Just checking..." container if they are too long. While it depends on the resolution, this problem doesn't happen with the other text within the container, which simply wraps onto a new line when it needs to.

Screenshots or videos showing encountered issue:

osu!lazer version: 2020.903.0

[GSculerlor]

Was about to fix it by moving out the link from OsuTextFlowContainer into separated OsuSpriteText since TextFlowContainer doesn't handle text with no spaces well (ppy/osu-framework#2982) but seems like defining RelativeSizeAxes for truncation make the text isn't centered

[bdach]

It should "just" be fixed framework-side.

[GSculerlor]

Fair point