Virtual slides in combination with "auto" slides per view crashes

[thomasowow]

Check that this is really a bug

• I confirm

Reproduction link

https://codesandbox.io/p/devbox/swiper-vue-virtual-slides-forked-h3ddkv

Bug description

When using the virtual slides feature in combination with a slidesPerView of 'auto' something in the updateSlides call fails. To be precise the following line throws "getComputedStyle: Argument 1 is not an object":

swiper/src/core/update/updateSlides.mjs

Line 101 in fc308b3

const slideStyles = getComputedStyle(slide);

Which indeed is true, slide is undefined here.

After some debugging I figured out that there is a mismatch between slides and slidesLength. slides is an empty array whereas slidesLength is a number above the expected 0.

Expected Behavior

It is expected that while using the virtual module, the updateSlides method will not throw when there are no slides yet.

Actual Behavior

It crashes when there are no slides yet.

Swiper version

11.0.6

Platform/Target and Browser Versions

Ubuntu 23.04, Firefox 121.0 (64-bit)

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

[nolimits4web]

Check documentation for virtual slides please