fix: exclude custom-select from generic floating label trigger

[michaelmkraus]

Proposed changes

• exclude custom-select from generic floating label trigger

resolves #4536

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/fix-4536-flickering-floating-label

[changeset-bot]

🦋 Changeset detected

Latest commit: 83f3a8e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@db-ux/core-components	Patch
@db-ux/ngx-core-components	Patch
@db-ux/react-core-components	Patch
@db-ux/wc-core-components	Patch
@db-ux/v-core-components	Patch
@db-ux/core-foundations	Patch
@db-ux/core-stylelint	Patch
@db-ux/core-migration	Patch
@db-ux/agent-cli	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[nmerget]

Suggested change

	#{$selector}:not(.db-custom-select-form-field):focus-within,
	#{$focus-within-selector}:focus-within,

[nmerget]

If we do it like this and this, the placeholder would be shown even if the focus is inside the dropdown. Which will show the "hint" of the placeholder while selecting a option

[nmerget]

Suggested change

	$focus-within-selector: $selector;
	@if ($selector == summary) {
	$focus-within-selector: "";
	}