updateAutoHeight doesn't update when newHeight is 0

[pjetrucha]

Check that this is really a bug

• I confirm

Reproduction link

https://codesandbox.io/s/swiper-autoheight-forked-4rq8q

Bug description

Hi,
First of all, thank you for a great tool which is Swiper!

I have a situation where my slides may be empty (0 height). With the autoHeight: true setting enabled, the script does not refresh heights for these empty slides.

This is due to this condition:

swiper/src/core/update/updateAutoHeight.js

Line 47 in e641fd2

if (newHeight) swiper.$wrapperEl.css('height', `${newHeight}px`);

Currently the only way for this to work is to set a min-height: 1px, but ideally this would be fixed in the script. Is there any reason this condition exists?

Expected Behavior

No response

Actual Behavior

No response

Swiper version

4e7a160

Platform/Target and Browser Versions

all

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Make sure this is a Swiper issue and not a framework-specific issue

Would you like to open a PR for this bug?

• I'm willing to open a PR