Drop all deprecated APIs

CHANGELOG.md

@@ -2,21 +2,22 @@
 
 * **Breaking change**: `close()` of `DelimiterSyntax` and `LinkSyntax`
   returns multiple nodes instead of single one.
-
-## 6.0.2-dev
-
-* Fix a crash in checkbox lists when mixing checkbox items with
-  non-checkbox items.
-* Add a new syntax `BlockHtmlSyntax` to parse HTML blocks.
+* **Breaking change**: Remove deprecated APIs, including `TagSyntax`,
+  `indicatorForCheckedCheckBox`, and `indicatorForUncheckedCheckBox`.
+* **Breaking change**: Removed `BlockHtmlSyntax`, `BlockTagBlockHtmlSyntax`,
+  `LongBlockHtmlSyntax`, and `OtherTagBlockHtmlSyntax`.
+* Add a new syntax `HtmlBlockSyntax` to parse HTML blocks.
 * Add a new syntax `DecodeHtmlSyntax` to decode HTML entity and numeric
   character references.
 * Add a new syntax `SoftLineBreakSyntax` to remove the single space before the
   line ending.
-* Deprecate `BlockTagBlockHtmlSyntax`, `LongBlockHtmlSyntax` and
-  `OtherTagBlockHtmlSyntax`. These syntaxes will be removed from the next major
-  version.
 * Add an option `caseSensitive` to `TextSyntax`.
 
+## 6.0.1
+
+* Fix a crash in checkbox lists when mixing checkbox items with
+  non-checkbox items.
+
 ## 6.0.0
 
 * Require Dart 2.17

lib/markdown.dart

@@ -38,7 +38,6 @@ import 'src/version.dart';
 
 export 'src/ast.dart';
 export 'src/block_parser.dart';
-export 'src/block_syntaxes/block_html_syntax.dart';
 export 'src/block_syntaxes/block_syntax.dart';
 export 'src/block_syntaxes/blockquote_syntax.dart';
 export 'src/block_syntaxes/code_block_syntax.dart';
@@ -68,6 +67,7 @@ export 'src/inline_syntaxes/autolink_extension_syntax.dart';
 export 'src/inline_syntaxes/autolink_syntax.dart';
 export 'src/inline_syntaxes/code_syntax.dart';
 export 'src/inline_syntaxes/color_swatch_syntax.dart';
+export 'src/inline_syntaxes/decode_html_syntax.dart';
 export 'src/inline_syntaxes/delimiter_syntax.dart';
 export 'src/inline_syntaxes/email_autolink_syntax.dart';
 export 'src/inline_syntaxes/emoji_syntax.dart';
@@ -80,7 +80,6 @@ export 'src/inline_syntaxes/line_break_syntax.dart';
 export 'src/inline_syntaxes/link_syntax.dart';
 export 'src/inline_syntaxes/soft_line_break_syntax.dart';
 export 'src/inline_syntaxes/strikethrough_syntax.dart';
-export 'src/inline_syntaxes/tag_syntax.dart';
 export 'src/inline_syntaxes/text_syntax.dart';
 
 const version = packageVersion;

lib/src/block_syntaxes/list_syntax.dart

@@ -9,18 +9,6 @@ import 'block_syntax.dart';
 import 'ordered_list_with_checkbox_syntax.dart';
 import 'unordered_list_with_checkbox_syntax.dart';
 
-/// As of Markdown 6.0.1 invisible indicators for checked/unchecked checkboxes are
-/// no longer used.  These constants are now empty strings to reflect that.
-@Deprecated(
-    'This string is no longer used internally.  It will be removed in a future version.')
-const indicatorForUncheckedCheckBox = '';
-
-/// As of Markdown 6.0.1 invisible indicators for checked/unchecked checkboxes are
-/// no longer used.  These constants are now empty strings to reflect that.
-@Deprecated(
-    'This string is no longer used internally.  It be will be removed in a future version.')
-const indicatorForCheckedCheckBox = '';
-
 class ListItem {
   const ListItem(
     this.lines, {