Input Number does not work in 'box' mode

[tinloaf]

Home Assistant release with the issue:
0.81.0.dev0

Last working Home Assistant release (if known):
Not sure

Browser and Operating System:
Chromium 69.0.3497.100 on Gentoo Linux

Description of problem:
input_numbers do not show any box if they are in box mode.

See also the long thread here: home-assistant/core#16957

Javascript errors shown in the web inspector (if applicable):
None that are applicable.

Additional information:
I think the problem is here:

https://github.com/home-assistant/home-assistant-polymer/blob/56a9ff2b3567693141b1a573fc5dab8919809d77/src/state-summary/state-card-input_number.js#L43-L44

The ha-slider tag is incorrectly closed as paper-slider, thus swallowing the following paper-input.

I'm trying to cook up a PR, but my frontend development environment is out of date, and setting up the whole node.js thing might take a while, so if anybody wants to go ahead and fix this… ;-)

[zsarnett]

#1861
Closing