8357869: Remove PreviewNote taglet in its current form

Reviewed-by: erikj

make/Docs.gmk

@@ -79,8 +79,6 @@ JAVADOC_TAGS := \
     -tag see \
     -taglet build.tools.taglet.ExtLink \
     -taglet build.tools.taglet.Incubating \
-    -taglet build.tools.taglet.PreviewNote \
-    --preview-note-tag previewNote \
     -tagletpath $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
     $(CUSTOM_JAVADOC_TAGS) \
     #

make/jdk/src/classes/build/tools/taglet/PreviewNote.java

@@ -1,127 +0,0 @@
-/*
- * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package build.tools.taglet;
-
-import java.util.EnumSet;
-import java.util.List;
-import java.util.Set;
-
-
-import javax.lang.model.element.Element;
-import javax.tools.Diagnostic;
-
-
-import com.sun.source.doctree.DocTree;
-import com.sun.source.doctree.UnknownInlineTagTree;
-import jdk.javadoc.doclet.Doclet;
-import jdk.javadoc.doclet.DocletEnvironment;
-import jdk.javadoc.doclet.Reporter;
-import jdk.javadoc.doclet.StandardDoclet;
-import jdk.javadoc.doclet.Taglet;
-
-import static com.sun.source.doctree.DocTree.Kind.UNKNOWN_INLINE_TAG;
-
-/**
- * An inline tag to insert a note formatted as preview note.
- * The tag can be used as follows:
- *
- * <pre>
- * {&commat;previewNote jep-number [Preview note heading]}
- * Preview note content
- * {&commat;previewNote}
- * </pre>
- *
- */
-public class PreviewNote implements Taglet {
-
-    static final String TAG_NAME = "previewNote";
-    Reporter reporter = null;
-
-    @Override
-    public void init(DocletEnvironment env, Doclet doclet) {
-        if (doclet instanceof StandardDoclet stdoclet) {
-            reporter = stdoclet.getReporter();
-        }
-    }
-
-    /**
-     * Returns the set of locations in which the tag may be used.
-     */
-    @Override
-    public Set<Location> getAllowedLocations() {
-        return EnumSet.allOf(Taglet.Location.class);
-    }
-
-    @Override
-    public boolean isInlineTag() {
-        return true;
-    }
-
-    @Override
-    public String getName() {
-        return TAG_NAME;
-    }
-
-    @Override
-    public String toString(List<? extends DocTree> tags, Element elem) {
-
-        for (DocTree tag : tags) {
-            if (tag.getKind() == UNKNOWN_INLINE_TAG) {
-                UnknownInlineTagTree inlineTag = (UnknownInlineTagTree) tag;
-                String[] content = inlineTag.getContent().toString().trim().split("\\s+", 2);
-                if (!content[0].isBlank()) {
-                    StringBuilder sb = new StringBuilder("""
-                       <div class="preview-block" style="margin-top:10px; display:block; max-width:max-content;">
-                       """);
-                    if (content.length == 2) {
-                        sb.append("""
-                                <div class="preview-label">
-                                """)
-                          .append(content[1])
-                          .append("""
-                                </div>
-                                """);
-                    }
-                    sb.append("""
-                            <div class="preview-comment">
-                            """);
-                    return sb.toString();
-                } else {
-                    return """
-                             </div>
-                             </div>
-                            """;
-                }
-            }
-        }
-
-        if (reporter == null) {
-            throw new IllegalArgumentException("@" + TAG_NAME + " taglet content must be begin or end");
-        }
-        reporter.print(Diagnostic.Kind.ERROR, "@" + TAG_NAME + " taglet content must be begin or end");
-        return "";
-    }
-}