[patch] #63348 Konqueror looses style sheets on kde.org and gentoo.org

[Germain Garand]

Rationale of the patch:
khtml uses sticky alternate sheets, thus it tries hard to find a match for the 
previously applied sheet name.

Problem: when parsing isn't finished, it can't know whether there will be 
other sheets added or not, and it often ends up not electing any sheet.

Proposed solution: if the tokenizer is still on, choose the most suitable 
sheet and store the name to continue the search on a later 
recalcStyleSelector call if any.

Fixes #63348 + comments #4/#5 of #54335

Patch also corrects a stylesheet related merging error in
HTMLLinkElementImpl::parseAttribute
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