feat(theme): [select] modify the scrollbar and popper to unify the style

[MomoPoppy]

PR

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• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Style
  • Updated the dark theme: The scrollbar track now displays a transparent background for a cleaner look.
  • Refined global scrollbar styling: Styles are now uniformly applied across viewports with improved selectors.
  • Enhanced popover appearance: Adjusted conditions ensure styling is applied only when visual cues are present.

[coderabbitai]

Walkthrough

This update modifies two LESS files related to theme styling. In dark-theme.less, the scrollbar track background color is changed from a black value to transparent. In reset.less, the scrollbar styles are adjusted to apply universally by removing a media query, selectors are reorganized (including scrollbar-corner handling), and popover selectors are updated to target only those with a child arrow. These changes impact only visual styling without affecting functionality.

Changes

File(s)	Change Summary
packages/theme/src/base/dark-theme.less	Updated CSS variable --tv-color-bg-scrollbar-track from var(--tv-base-color-common-13) (black) to transparent.
packages/theme/src/base/reset.less	Removed media query for scrollbar styles, reorganized scrollbar selectors (added ::-webkit-scrollbar-corner, removed ::-webkit-scrollbar-track-piece), and updated popover selectors to include :has(.popper__arrow).

Possibly related PRs

• fix(site): document search box adapts to the dark theme. #3046: Adjusts dark theme selectors (from .dark to html.dark), linking to the visual updates in scrollbar styling.
• feat(theme): [button] add dark themes, modify other theme variables and component level variables #2898: Involves CSS variable updates in dark themes, aligning with the scrollbar track background change.

Suggested labels

enhancement

Suggested reviewers

• zzcr

Poem

I'm a little rabbit, hopping in the night,
Tweaking theme styles with all my might.
Scrollbars turn transparent in a moonlit dance,
Popovers and arrows join the prance.
Code and whiskers in a joyful spree—
A celebration of CSS, wild and free!

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📥 Commits

Reviewing files that changed from the base of the PR and between 0b5a346 and e6e736f.

📒 Files selected for processing (2)

• packages/theme/src/base/dark-theme.less (1 hunks)
• packages/theme/src/base/reset.less (3 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: PR E2E Test (pnpm test:e2e3)

🔇 Additional comments (3)

packages/theme/src/base/dark-theme.less (1)

516-516: Scrollbar Track Background Update

The scrollbar track background color is now defined as transparent rather than using the dark common color. This update is pivotal for achieving the unified style envisioned in the PR. Please ensure that this transparent setting integrates well with all themes and that it doesn’t adversely affect visibility on different backgrounds.

packages/theme/src/base/reset.less (2)

155-182: Enhanced Scrollbar Styling with CSS Variables

The scrollbar styling has been reorganized to leverage CSS custom properties for width, height, and background colors. In particular, the ::-webkit-scrollbar, ::-webkit-scrollbar-corner, and ::-webkit-scrollbar-track selectors consistently use var(--tv-color-bg-scrollbar-track), ensuring visual alignment with the dark theme changes. Please verify this implementation in target browsers (notably WebKit-based ones) to confirm consistent rendering.

---

205-207: Refined Popper Selector with :has Pseudo-class

The updated selectors now apply styles only when the popover element contains a child with the .popper__arrow class, thanks to the new use of :has(.popper__arrow). This is a clean approach to restrict the styles to arrow-containing popovers. However, ensure that the browsers targeted by your project fully support the :has pseudo-class. It may be beneficial to include a note in your documentation regarding any known compatibility issues.

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[petercat-assistant]

Walkthrough

This pull request modifies the scrollbar and popper styles in the tiny-vue theme to unify their appearance. The changes involve setting the scrollbar track to be transparent and adjusting the popper styles to ensure consistent styling across components.

Changes

File	Summary
packages/theme/src/base/dark-theme.less	Changed scrollbar track color to transparent.
packages/theme/src/base/reset.less	Unified scrollbar styles and adjusted popper styles for elements with arrows.

[petercat-assistant]

The use of :has() pseudo-class is not supported in all browsers. Ensure compatibility with your target browsers or provide a fallback.