From 1b105202f19dea5dbdb817798055d2e30b7854db Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ella=20van=C2=A0Durpe?= <iseulde@automattic.com>
Date: Thu, 21 Mar 2019 21:41:10 +0100
Subject: [PATCH] Paste: check plain text for gutenberg content (#14536)

---
 packages/blocks/src/api/raw-handling/paste-handler.js | 11 ++++++++---
 test/integration/blocks-raw-handling.spec.js          |  8 ++++++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/packages/blocks/src/api/raw-handling/paste-handler.js b/packages/blocks/src/api/raw-handling/paste-handler.js
index b40164f549689b..1d67540c0b9225 100644
--- a/packages/blocks/src/api/raw-handling/paste-handler.js
+++ b/packages/blocks/src/api/raw-handling/paste-handler.js
@@ -127,9 +127,14 @@ export function pasteHandler( { HTML = '', plainText = '', mode = 'AUTO', tagNam
 	// First of all, strip any meta tags.
 	HTML = HTML.replace( /<meta[^>]+>/, '' );
 
-	// If we detect block delimiters, parse entirely as blocks.
-	if ( mode !== 'INLINE' && HTML.indexOf( '<!-- wp:' ) !== -1 ) {
-		return parseWithGrammar( HTML );
+	// If we detect block delimiters in HTML, parse entirely as blocks.
+	if ( mode !== 'INLINE' ) {
+		// Check plain text if there is no HTML.
+		const content = HTML ? HTML : plainText;
+
+		if ( content.indexOf( '<!-- wp:' ) !== -1 ) {
+			return parseWithGrammar( content );
+		}
 	}
 
 	// Normalize unicode to use composed characters.
diff --git a/test/integration/blocks-raw-handling.spec.js b/test/integration/blocks-raw-handling.spec.js
index 72426e00094fb8..83315ba0d38a68 100644
--- a/test/integration/blocks-raw-handling.spec.js
+++ b/test/integration/blocks-raw-handling.spec.js
@@ -221,6 +221,14 @@ describe( 'Blocks raw handling', () => {
 		expect( console ).toHaveLogged();
 	} );
 
+	it( 'should paste gutenberg content from plain text', () => {
+		const block = '<!-- wp:latest-posts /-->';
+		expect( serialize( pasteHandler( {
+			plainText: block,
+			mode: 'AUTO',
+		} ) ) ).toBe( block );
+	} );
+
 	describe( 'pasteHandler', () => {
 		[
 			'plain',