Treat whitespace-only text nodes between element siblings as part of the
previous element instead of creating a separate text node.
generateFragmentFromHtml now detects when a text node consisting only of
space appears between two elements and appends that space to the
previous instance's last text child (if present), avoiding creation of a
standalone text child. Added a regression test in plugin-html.test.tsx
to verify pasted HTML like `<span>✓</span> <span>text</span>` preserves
the space and results in two span instances (no separate text node),
ensuring text-content control remains correct in the settings panel.
## Description
1. What is this PR about (link the issue and add a short description)
## Steps for reproduction
1. click button
2. expect xyz
## Code Review
- [ ] hi @kof, I need you to do
- conceptual review (architecture, feature-correctness)
- detailed review (read every line)
- test it on preview
## Before requesting a review
- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")
## Before merging
- [ ] tested locally and on preview environment (preview dev login:
0000)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file
Oleg Isonen