fix: identical means identical bytes – text parts count, pages and posts only (ruling Q25)

- Fingerprint::content() includes non-whitespace text parts (raw HTML between
  blocks, inner HTML of core blocks) and opaque blocks with all their bytes;
  structure() unchanged; find-similar "identical" follows
- make-global mode 2 also compares Fingerprint::canonical() bytes of each node
- sources and targets: post types page and post only (POST_TYPES)
- a rolled-back page N>1 keeps DiviSaver's "Revision X bleibt erhalten"
- guide: escaped divi/global-layout re-expanded by Divi's do_blocks in
  shortcode-module and WooCommerce text output documented as residual risk

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

docs/guides/divi-library.md

@@ -17,7 +17,11 @@ Die Divi-Bibliothek speichert Layouts, Abschnitte, Zeilen und Module zur Wiederv
   und Divi-4-Shortcodes mit `global_module` – auch in Texten von Divi-5-Modulen. Im Zweifel zählt eine Seite
   mit: ein Verweis, der sich nicht eindeutig lesen lässt, und ein `global_module`, das keine gültige Zahl ist
   (Divi zeigt dann den neuesten Eintrag), gelten als Verweis auf jeden Eintrag. Sehr ungewöhnliche Schreibweisen
-  können trotzdem unerkannt bleiben. Steckt der Eintrag in einem wiederverwendbaren Block (`wp_block`), erscheint
+  können trotzdem unerkannt bleiben; dazu gehört ein maskiert in einem Modulwert gespeicherter
+  `divi/global-layout`-Block: Divi wertet Blöcke in der Ausgabe von Shortcode-Modulen und in
+  WooCommerce-Textmodulen (Warenkorb, Kasse) erneut aus, sodass er dort als globales Modul erscheinen kann
+  (bekanntes Restrisiko, wie die übrigen ungewöhnlichen Schreibweisen; es braucht Bearbeitungsrechte auf der
+  verweisenden Seite). Steckt der Eintrag in einem wiederverwendbaren Block (`wp_block`), erscheint
   dieser Block in der Liste, nicht die Seite, die ihn einbettet – wie bei Divi selbst.
 - `lit-library-insert`: einen Eintrag in eine Divi-Seite einfügen. `mode: "global"` (Standard bei globalen
   Einträgen) fügt eine verknüpfte Instanz ein, `mode: "copy"` (Standard sonst) eine unabhängige Kopie.

src/Integrations/Divi/BlockTree/Fingerprint.php

@@ -12,8 +12,10 @@ defined('ABSPATH') || exit;
  * Fingerprints of a node (E11) for lit/library-find-similar, the "similar section" warning (spec §5.5) and
  * lit/library-make-global. structure(): block names and nesting, column layout (flexType) and preset IDs – two
  * sections built alike with other texts share it. content(): every attribute but the admin label,
- * builderVersion and globalParent, children included – "the same section". Whitespace between blocks never
- * counts; an opaque block counts by its raw opener (content) or its effective type (structure). Pure PHP.
+ * builderVersion and globalParent, children and every non-whitespace text part included – "the same section"
+ * (ruling Q25: raw HTML between blocks and the inner HTML of core blocks are visible too). Whitespace between
+ * blocks never counts; an opaque block counts with all its bytes (content) or by its effective type (structure).
+ * Pure PHP.
  */
 final class Fingerprint
 {
@@ -30,6 +32,17 @@ final class Fingerprint
         return self::hash(self::body($block));
     }
 
+    /**
+     * The normalized bytes content() hashes (ruling Q25): block names, attributes with sorted keys (without admin
+     * label, builderVersion, globalParent), every non-whitespace text part – raw HTML or shortcodes between blocks
+     * and the inner HTML of core blocks – and opaque blocks with all their bytes. Two nodes with the same
+     * canonical() look the same to visitors; lit/library-make-global compares these bytes, not only the hash.
+     */
+    public static function canonical(Block $block): string
+    {
+        return self::body($block);
+    }
+
     private static function shape(Block $block): string
     {
         if ($block->isOpaque()) {
@@ -47,7 +60,7 @@ final class Fingerprint
     private static function body(Block $block): string
     {
         if ($block->isOpaque()) {
-            return 'opaque:' . (string) $block->rawOpen();
+            return 'opaque:' . self::text(Serializer::block($block));
         }
 
         $attrs = $block->attrs();
@@ -57,9 +70,22 @@ final class Fingerprint
         if (is_array($attrs['module']['meta'] ?? null)) {
             unset($attrs['module']['meta']['adminLabel']);
         }
-        $children = array_map(self::body(...), $block->children());
+        $parts = [];
+        foreach ($block->isVoid() ? [] : $block->parts() as $part) {
+            if ($part instanceof Block) {
+                $parts[] = self::body($part);
+            } elseif (trim($part) !== '') {
+                $parts[] = 'text:' . Json::encode(self::text($part));
+            }
+        }
 
-        return $block->name() . Json::encode(self::sorted($attrs)) . '[' . implode(';', $children) . ']';
+        return $block->name() . Json::encode(self::sorted($attrs)) . '[' . implode(';', $parts) . ']';
+    }
+
+    /** Text as visitors get it: line breaks unified, whitespace at both ends dropped. */
+    private static function text(string $text): string
+    {
+        return trim(str_replace("\r\n", "\n", $text));
     }
 
     /** Object keys sorted at every depth, so the key order Divi or the plugin wrote does not count. */

src/Integrations/Divi/Library/LibraryMakeGlobalAbility.php

@@ -40,17 +40,19 @@ defined('ABSPATH') || exit;
  * instance the Visual Builder writes (GlobalInstance::of). All or nothing: the page is written through
  * DiviWriter::commit() (tree_rev lock, revision); when it is refused or rolled back, the new entry is deleted
  * again (NewDraft) – only a page write that may have been saved (partial) keeps the entry, because the page may
- * already show it. Sources are pages and posts only: no library entries (no nesting, ruling P11) and no Theme
- * Builder layouts (controller ruling; there lit/library-save and lit-library-insert). Needs the rights of
+ * already show it. Sources are pages and posts only (post types page and post, ruling Q25): no library entries
+ * (no nesting, ruling P11), no Theme Builder layouts (ruling Q24; there lit/library-save and lit-library-insert)
+ * and no other Divi-enabled types. Needs the rights of
  * lit/library-save with scope "global" and of lit-library-insert, and follows lit-divi-insert (audit M2).
  *
  * Second mode (E10, answer F2): library_id plus targets replaces further occurrences – only nodes whose content
- * fingerprint equals the entry's root ("identical" in lit/library-find-similar) – by instances of that active
+ * fingerprint and normalized bytes (Fingerprint::canonical, ruling Q25: visible text parts included) equal the
+ * entry's root ("identical" in lit/library-find-similar) – by instances of that active
  * global entry (one readable root, no reference to any entry in any spelling, ruling Q7). A global edit: every
  * target is checked first (edit_post and tree_rev through DiviWriter::page(), P8a – the account changes only pages
- * it may edit; identical nodes; the instance passes the page's StoredNodeGuard; pages and posts only, no library
- * entries or Theme Builder layouts), then a dry run lists the pages (tree_rev, status, live – drafts are listed,
- * like P8a), and only confirm: true writes. Every page goes through DiviWriter::commit() with its own tree_rev
+ * it may edit; identical nodes; the instance passes the page's StoredNodeGuard; post types page and post only),
+ * then a dry run lists the pages (tree_rev, status, live – drafts are listed, like P8a), and only confirm: true
+ * writes. Every page goes through DiviWriter::commit() with its own tree_rev
  * lock, revision and change-log row; a live page (publish, private, future) without revisions first gets
  * VisibleEdits' backup, refused for every page before anything is written where it could not be faithful (P9).
  * Pages are written in the given order; when page N fails, pages 1..N-1 stay replaced (each with its restore
@@ -68,6 +70,9 @@ final class LibraryMakeGlobalAbility implements Ability
 
     private const TYPE_LABELS = ['section' => 'Abschnitt', 'row' => 'Zeile', 'module' => 'Modul'];
 
+    /** Post types that are sources and targets (ruling Q25): pages and posts, no other Divi-enabled type. */
+    public const POST_TYPES = ['page', 'post'];
+
     /** Inputs of the first mode, refused next to library_id. */
     private const NODE_INPUT = ['post_id', 'tree_rev', 'id', 'title', 'categories', 'tags'];
 
@@ -102,8 +107,9 @@ final class LibraryMakeGlobalAbility implements Ability
     public function description(): string
     {
         return 'Wandelt einen Divi-Knoten (post_id, tree_rev und id aus lit-divi-outline, title) auf einer Seite oder '
-            . 'in einem Beitrag in ein globales Modul um: legt einen globalen Bibliothekseintrag mit genau diesem '
-            . 'Inhalt an und ersetzt den Knoten durch die verknüpfte Instanz – alles oder nichts. Danach zeigt die '
+            . 'in einem Beitrag (Inhaltstypen page und post) in ein globales Modul um: legt einen globalen '
+            . 'Bibliothekseintrag mit genau diesem Inhalt an und ersetzt den Knoten durch die verknüpfte Instanz – '
+            . 'alles oder nichts. Danach zeigt die '
             . 'Seite den Inhalt aus der Bibliothek; Änderungen dort wirken auf alle Seiten mit diesem Modul.'
             . ' Gleichartige Vorkommen danach ersetzen: library_id plus targets (je post_id, tree_rev und ids '
             . 'inhaltsgleicher Knoten aus lit/library-find-similar, match "identical"; nur Seiten und Beiträge); das '
@@ -370,6 +376,7 @@ final class LibraryMakeGlobalAbility implements Ability
         }
 
         $fingerprint = Fingerprint::content($root);
+        $canonical = Fingerprint::canonical($root);
         $plans = [];
         $errors = [];
         $seen = [];
@@ -383,9 +390,9 @@ final class LibraryMakeGlobalAbility implements Ability
                 return $page;
             }
             $postId = (int) $page->post->ID;
-            if ($page->isLibraryItem() || $page->isThemeBuilderLayout() || isset($seen[$postId])) {
-                $errors["targets.$i.post_id"] = 'nur Seiten und Beiträge, jede einmal (Theme-Builder-Layouts und '
-                    . 'Bibliothekseinträge einzeln mit lit-library-insert)';
+            if (self::sourceRefusal($page) !== null || isset($seen[$postId])) {
+                $errors["targets.$i.post_id"] = 'nur Seiten und Beiträge (page, post), jede einmal (andere Einträge '
+                    . 'einzeln mit lit-library-insert)';
                 continue;
             }
             $seen[$postId] = true;
@@ -397,7 +404,10 @@ final class LibraryMakeGlobalAbility implements Ability
             $nodes = [];
             foreach ($ids as $j => $id) {
                 $node = is_string($id) ? $page->index->find($id) : null;
-                if ($node === null || $node->isOpaque() || Fingerprint::content($node) !== $fingerprint) {
+                // The hash first (cheap), then the normalized bytes themselves (ruling Q25) – no collision counts.
+                $identical = $node !== null && ! $node->isOpaque() && Fingerprint::content($node) === $fingerprint
+                    && Fingerprint::canonical($node) === $canonical;
+                if (! $identical) {
                     $errors["targets.$i.ids.$j"] = 'kein inhaltsgleiches Vorkommen des Eintrags (nur match "identical" '
                         . 'aus lit/library-find-similar)';
                     continue;
@@ -512,9 +522,11 @@ final class LibraryMakeGlobalAbility implements Ability
             return $e->withDetails($details);
         }
 
+        // DiviSaver's own state stays (e.g. "Revision X bleibt erhalten").
         $state = sprintf(
-            'Seite %d wurde nicht geändert. Bereits ersetzt (je mit Revision): %s; unverändert: %s.',
+            'Seite %d: %s Bereits ersetzt (je mit Revision): %s; unverändert: %s.',
             $postId,
+            $e->state ?? 'Die Änderung wurde nicht gespeichert.',
             implode(', ', $done),
             $rest === [] ? 'keine weiteren' : implode(', ', $rest)
         );
@@ -579,8 +591,9 @@ final class LibraryMakeGlobalAbility implements Ability
     }
 
     /**
-     * Only pages and posts: a library entry would nest global modules (P11), a Theme Builder layout is left to
-     * lit/library-save plus lit-library-insert (controller ruling on the plan's open point).
+     * Only pages and posts (POST_TYPES, ruling Q25): a library entry would nest global modules (P11), a Theme
+     * Builder layout is left to lit/library-save plus lit-library-insert (ruling Q24), other Divi-enabled types
+     * are out of scope.
      */
     private static function sourceRefusal(DiviPage $page): ?WP_Error
     {
@@ -600,6 +613,13 @@ final class LibraryMakeGlobalAbility implements Ability
             );
         }
 
+        if (! in_array((string) $page->post->post_type, self::POST_TYPES, true)) {
+            return Errors::invalidInput(
+                'lit/library-make-global arbeitet nur auf Seiten und Beiträgen; nichts wurde gespeichert.',
+                ['post_id' => 'eine Seite oder ein Beitrag (Inhaltstyp page oder post)']
+            );
+        }
+
         return null;
     }
 

tests/Unit/Integrations/Divi/BlockTree/FingerprintTest.php

@@ -68,4 +68,68 @@ final class FingerprintTest extends TestCase
         self::assertNotSame(Fingerprint::structure($a), Fingerprint::structure($b));
         self::assertNotSame(Fingerprint::structure($a), Fingerprint::structure($c));
     }
+
+    /** The section of 1055 with $extra inserted at the end of its column (review of Task 15, ruling Q25). */
+    private static function sectionWith(string $extra): Block
+    {
+        $markup = DiviFixtures::markup('stage3/library--library-abschnitt.html');
+        $at = strrpos($markup, '<!-- /wp:divi/column -->');
+        $markup = substr($markup, 0, (int) $at) . $extra . substr($markup, (int) $at);
+
+        return LibraryContent::roots(LibraryContent::load(new Parser(), $markup))[0];
+    }
+
+    /** @return array<string, array{string, string}> */
+    public static function visibleExtras(): array
+    {
+        return [
+            'raw html between blocks' => ['<p>ONLY ON B</p>', '<p>ONLY ON C</p>'],
+            'core paragraph' => [
+                '<!-- wp:paragraph --><p>ONLY ON B</p><!-- /wp:paragraph -->',
+                '<!-- wp:paragraph --><p>ONLY ON C</p><!-- /wp:paragraph -->',
+            ],
+            'divi 4 shortcode text' => ['[et_pb_text]ONLY ON B[/et_pb_text]', '[et_pb_text]ONLY ON C[/et_pb_text]'],
+        ];
+    }
+
+    /**
+     * Ruling Q25: text parts are visible – raw HTML between blocks and the inner HTML of core blocks count
+     * for the content, like attributes.
+     *
+     * @dataProvider visibleExtras
+     */
+    public function testVisibleTextPartsCountForTheContent(string $extra, string $other): void
+    {
+        $plain = self::section();
+
+        self::assertNotSame(Fingerprint::content($plain), Fingerprint::content(self::sectionWith($extra)));
+        self::assertNotSame(
+            Fingerprint::content(self::sectionWith($extra)),
+            Fingerprint::content(self::sectionWith($other))
+        );
+        self::assertNotSame(Fingerprint::canonical($plain), Fingerprint::canonical(self::sectionWith($extra)));
+    }
+
+    public function testRawTextKeepsTheStructureAndWhitespaceNeverCounts(): void
+    {
+        $plain = self::section();
+
+        self::assertSame(Fingerprint::structure($plain), Fingerprint::structure(self::sectionWith('<p>x</p>')));
+        self::assertSame(Fingerprint::content($plain), Fingerprint::content(self::sectionWith("\n  \n")));
+        self::assertSame(Fingerprint::canonical($plain), Fingerprint::canonical(self::sectionWith("\n\t")));
+    }
+
+    /** Opaque blocks count with all their bytes (a global instance's snapshot included). */
+    public function testOpaqueBlocksCountWithAllTheirBytes(): void
+    {
+        $instance = static fn (string $text): Block => LibraryContent::roots(LibraryContent::load(
+            new Parser(),
+            '<!-- wp:divi/placeholder --><!-- wp:divi/section --><!-- wp:divi/row --><!-- wp:divi/column -->'
+                . '<!-- wp:divi/global-layout {"globalModule":"5","blockName":"divi/text"} --><p>' . $text
+                . '</p><!-- /wp:divi/global-layout -->'
+                . '<!-- /wp:divi/column --><!-- /wp:divi/row --><!-- /wp:divi/section --><!-- /wp:divi/placeholder -->'
+        ))[0];
+
+        self::assertNotSame(Fingerprint::content($instance('a')), Fingerprint::content($instance('b')));
+    }
 }

tests/Unit/Integrations/Divi/Library/LibraryFindSimilarAbilityTest.php

@@ -212,4 +212,33 @@ final class LibraryFindSimilarAbilityTest extends TestCase
         self::assertCount(5, $rest['matches']);
         self::assertArrayNotHasKey('note', $rest);
     }
+
+    /** Ruling Q25: raw HTML next to the blocks is visible – such a copy is only "structure", never "identical". */
+    public function testExtraVisibleTextIsNotIdentical(): void
+    {
+        $root = LibraryContent::roots(LibraryContent::load(
+            new Parser(),
+            DiviFixtures::markup('stage3/library--library-abschnitt.html')
+        ))[0];
+        $copy = Serializer::block($root);
+        $at = strrpos($copy, '<!-- /wp:divi/column -->');
+        $changed = substr($copy, 0, (int) $at) . '<p>ONLY ON 8</p>' . substr($copy, (int) $at);
+        LibraryFixtures::given([
+            LibraryFixtures::item(1055),
+            new WP_Post(['ID' => 8, 'post_type' => 'page', 'post_status' => 'publish', 'post_title' => 'Über uns',
+                'post_content' => '<!-- wp:divi/placeholder -->' . $changed . '<!-- /wp:divi/placeholder -->']),
+        ]);
+        Functions\when('get_post_type_object')->justReturn((object) ['cap' => (object) [
+            'edit_posts' => 'edit_posts',
+            'edit_others_posts' => 'edit_others_posts',
+        ]]);
+        Functions\when('get_posts')->justReturn([8]);
+
+        $result = self::ability()->execute(['library_id' => 1055, 'post_type' => 'page']);
+
+        self::assertSame(['8 s0 structure'], array_map(
+            static fn (array $m): string => $m['post_id'] . ' ' . $m['id'] . ' ' . $m['match'],
+            $result['matches']
+        ));
+    }
 }

tests/Unit/Integrations/Divi/Library/LibraryMakeGlobalAbilityTest.php

@@ -490,4 +490,78 @@ final class LibraryMakeGlobalAbilityTest extends TestCase
         }
         self::assertSame([], $this->saved);
     }
+
+    /** @return array<string, array{string}> */
+    public static function visibleExtras(): array
+    {
+        return [
+            'core paragraph' => ['<!-- wp:paragraph --><p>ONLY ON 8</p><!-- /wp:paragraph -->'],
+            'raw text part' => ['<p>ONLY ON 8</p>'],
+        ];
+    }
+
+    /**
+     * Ruling Q25 (review of Task 15): a copy with extra visible text – a core paragraph or raw HTML between
+     * blocks – is no identical occurrence; replacing it would swap visible content.
+     *
+     * @dataProvider visibleExtras
+     */
+    public function testACopyWithExtraVisibleTextIsNoIdenticalOccurrence(string $extra): void
+    {
+        $copy = $this->givenCopiesOf1058();
+        $at = strrpos($copy, '<!-- /wp:divi/column -->');
+        $changed = substr($copy, 0, (int) $at) . $extra . substr($copy, (int) $at);
+        LibraryFixtures::given([
+            LibraryFixtures::item(1058),
+            new WP_Post(['ID' => 8, 'post_type' => 'page', 'post_status' => 'publish', 'post_title' => 'Team',
+                'post_content' => '<!-- wp:divi/placeholder -->' . $changed . '<!-- /wp:divi/placeholder -->']),
+            get_post(9),
+        ]);
+
+        $result = $this->ability()->execute(self::targets(['s0'], ['s1'], true));
+
+        self::assertToolError($result, 'validation_failed');
+        self::assertArrayHasKey('targets.0.ids.0', self::errorFields($result));
+        self::assertSame([], $this->saved);
+    }
+
+    /** Scope (ruling Q25): only pages and posts – other Divi-enabled types are neither targets nor sources. */
+    public function testOnlyPagesAndPostsAreTargetsAndSources(): void
+    {
+        $this->givenCopiesOf1058();
+        $project = get_post(8);
+        $project->post_type = 'project';
+        LibraryFixtures::given([LibraryFixtures::item(1058), $project, get_post(9)]);
+
+        $target = $this->ability()->execute(self::targets(['s0'], ['s1'], true));
+        self::assertToolError($target, 'validation_failed');
+        self::assertArrayHasKey('targets.0.post_id', self::errorFields($target));
+
+        $source = $this->ability()->execute(
+            ['post_id' => 8, 'tree_rev' => Rev::of((string) $project->post_content), 'id' => 's0', 'title' => 'x']
+        );
+        self::assertToolError($source, 'validation_failed');
+        self::assertArrayHasKey('post_id', self::errorFields($source));
+        self::assertSame([], $this->saved);
+        self::assertSame([], $this->specs);
+    }
+
+    /** A rolled-back page N>1 keeps DiviSaver's note on the revision that stays. */
+    public function testAFailureMidwayKeepsTheRevisionNote(): void
+    {
+        $this->givenCopiesOf1058();
+        $kept = WriteFailed::rolledBack(
+            'Die Divi-Seite konnte nicht gespeichert werden.',
+            state: \LIT\MCP\Abilities\Errors::notSavedKeeping('Revision 812')
+        );
+
+        try {
+            $this->ability([], true, false, [null, $kept])->execute(self::targets(['s0'], ['s1'], true));
+            self::fail('no WriteFailed');
+        } catch (WriteFailed $e) {
+            $message = (string) $e->toError()->get_error_message();
+            self::assertStringContainsString('Revision 812 bleibt erhalten', $message);
+            self::assertStringContainsString('Bereits ersetzt', $message);
+        }
+    }
 }