Respect enableTagfilter when inlineOnly is passed

[srawlins]

See b/536201032

[github-actions]

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[gemini-code-assist]

Code Review

This pull request fixes a bug in markdownToHtml where the enableTagfilter option was ignored when inlineOnly was set to true. It also adds a corresponding test case and updates the CHANGELOG. The feedback suggests changing "Fix" to "Fixes" in the CHANGELOG entry to maintain grammatical consistency with other bullet points.

[github-actions]

PR Health

Unused Dependencies ⚠️

Package	Status
markdown	❗ Show Issues These packages may be unused, or you may be using assets from these packages: * meta

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// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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Coverage ✔️

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pkgs/markdown/lib/src/html_renderer.dart	💚 100 %

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
markdown	Non-Breaking	7.3.1	7.4.0	7.4.0	✔️

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