Virtual slides ignore initialSlide in the beginning

[m345054]

Check that this is really a bug

• I confirm

Reproduction link

https://jsfiddle.net/bqv2137n/11/

Bug description

When using initialSlide setting together with virtual, there is extra computing happening. Despite the value of initialSlide, Swiper currently always calls renderSlide with 0&1 indexes before rendering initialSlide slide. This is costly, when my createSlide() function is heavy.

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Copied from #2755
This error still exists in v11.0.7

Expected Behavior

Console Output:

Slide 4
Slide 5
Slide 6

Actual Behavior

Console Output:

Slide 0
Slide 1
Slide 4
Slide 5
Slide 6

Swiper version

v11.0.7

Platform/Target and Browser Versions

Windows, Chrome

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]

t0ggles-create swiper

[t0ggles]

Task nolimits4web/SWIPER-72 was created

[t0ggles]

Task nolimits4web/SWIPER-72 status changed to Done

[matichouraider]

@nolimits4web This doesn't work with React.