diff --git a/src/app/editor/ckeditorgithubeditor.js b/src/app/editor/ckeditorgithubeditor.js
index 759206e..062fa34 100644
--- a/src/app/editor/ckeditorgithubeditor.js
+++ b/src/app/editor/ckeditorgithubeditor.js
@@ -8,6 +8,7 @@ import GFMDataProcessor from '@ckeditor/ckeditor5-markdown-gfm/src/gfmdataproces
 import CKEditorInspector from '@ckeditor/ckeditor5-inspector';
 import AttributeElement from '@ckeditor/ckeditor5-engine/src/view/attributeelement';
 
+import PendingActions from '@ckeditor/ckeditor5-core/src/pendingactions';
 import Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';
 import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
 import Enter from '../plugins/enter';
@@ -118,5 +119,6 @@ CKEditorGitHubEditor.builtinPlugins = [
 	QuoteSelection, SavedReplies, Messenger, EditorExtras, ControlClick, SmartCaret,
 	CodeBlockLanguageSelector,
 	LiveModelData,
-	Mermaid
+	Mermaid,
+	PendingActions
 ];
diff --git a/src/app/editor/setupmixin.js b/src/app/editor/setupmixin.js
index ff13991..3e8aa42 100644
--- a/src/app/editor/setupmixin.js
+++ b/src/app/editor/setupmixin.js
@@ -141,6 +141,14 @@ const SetupMixin = {
 		// Reset the rte editor on form reset (e.g. after a new comment is added).
 		{
 			this.domManipulator.addEventListener( form, 'reset', () => {
+				if ( this.ckeditor.plugins.has( 'PendingActions' ) ) {
+					const pendingActions = ckeditor.plugins.get( 'PendingActions' );
+
+					// Remove submit pending action to undisable actual submit button
+					if ( pendingActions.hasAny ) {
+						pendingActions.fire( 'change:removeAction', 'submit' );
+					}
+				}
 				// We actually want it 'after-reset', so form elements are clean, thus setTimeout.
 				setTimeout( () => {
 					this.setCKEditorData( this.dom.textarea.defaultValue );
@@ -171,6 +179,18 @@ const SetupMixin = {
 						ev.preventDefault();
 						ev.stopImmediatePropagation();
 					}
+
+					if ( this.ckeditor.plugins.has( 'PendingActions' ) ) {
+						const pendingActions = ckeditor.plugins.get( 'PendingActions' );
+
+						// Add submit pending action to disable actual submit button for preventing possibility
+						// clicking on that more than one time.
+						if ( !this.ckeditor.plugins.get( 'PendingActions' ).hasAny ) {
+							setTimeout( () => {
+								pendingActions.fire( 'change:addAction', 'submit' );
+							} );
+						}
+					}
 				}
 			} );
 		}
@@ -333,10 +353,28 @@ const SetupMixin = {
 	_setupPendingActions() {
 		if ( this.ckeditor.plugins.has( 'PendingActions' ) ) {
 			const pendingActions = this.ckeditor.plugins.get( 'PendingActions' );
+			const actions = new Map();
 
 			pendingActions.on( 'change:hasAny', () => {
 				this._setSubmitStatus();
 			} );
+
+			// Add to PendingActions collection new action.
+			pendingActions.on( 'change:addAction', ( _, name ) => {
+				const action = pendingActions.add( name );
+
+				actions.set( name, action );
+			} );
+
+			// Remove action from PendingActions collection.
+			pendingActions.on( 'change:removeAction', ( _, name ) => {
+				const action = actions.get( name );
+
+				if ( action ) {
+					pendingActions.remove( action );
+					actions.delete( name );
+				}
+			} );
 		}
 	}
 };
diff --git a/tests/unit/editor/setupmixin.js b/tests/unit/editor/setupmixin.js
index 45fe39b..9bdf78e 100644
--- a/tests/unit/editor/setupmixin.js
+++ b/tests/unit/editor/setupmixin.js
@@ -631,6 +631,143 @@ describe( 'Editor', () => {
 						expect( editor ).to.be.an.instanceOf( Editor );
 					} );
 			} );
+
+			it( 'should call "change:addAction" event', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+
+				const editor = new Editor( GitHubPage.appendRoot( ) );
+
+				return editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( pendingActions, 'add' );
+
+						pendingActions.fire( 'change:addAction', 'submit' );
+
+						expect( spy.callCount ).to.equals( 1 );
+					} );
+			} );
+
+			it( 'should call "change:removeAction" event', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+
+				const editor = new Editor( GitHubPage.appendRoot( ) );
+
+				return editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( pendingActions, 'remove' );
+
+						pendingActions.fire( 'change:addAction', 'submit' );
+
+						pendingActions.fire( 'change:removeAction', 'submit' );
+
+						expect( spy.callCount ).to.equals( 1 );
+					} );
+			} );
+
+			it( 'should not call "change:removeAction" event if the are no pending action', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+
+				const editor = new Editor( GitHubPage.appendRoot( ) );
+
+				return editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( pendingActions, 'remove' );
+
+						pendingActions.fire( 'change:removeAction', 'submit' );
+
+						expect( spy.callCount ).to.equals( 0 );
+					} );
+			} );
+
+			it( 'should not remove pending action', done => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+				const editor = new Editor( GitHubPage.appendRoot() );
+				editor.dom.root.querySelector( 'textarea' ).defaultValue = 'Test';
+
+				editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( pendingActions, 'remove' );
+
+						editor.setData( 'Changed data' );
+						editor.dom.textarea.form.dispatchEvent( new Event( 'reset' ) );
+
+						setTimeout( () => {
+							expect( spy.callCount ).to.equals( 0 );
+							done();
+						}, 1 );
+					} );
+			} );
+
+			it( 'should remove pending action', done => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+				const editor = new Editor( GitHubPage.appendRoot() );
+				editor.dom.root.querySelector( 'textarea' ).defaultValue = 'Test';
+
+				editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( pendingActions, 'remove' );
+
+						pendingActions.fire( 'change:addAction', 'submit' );
+						editor.setData( 'Changed data' );
+						editor.dom.textarea.form.dispatchEvent( new Event( 'reset' ) );
+
+						setTimeout( () => {
+							expect( spy.callCount ).to.equals( 1 );
+							done();
+						}, 1 );
+					} );
+			} );
+
+			it( 'should sync editors on submit.click', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+				const editor = new Editor( GitHubPage.appendRoot() );
+
+				return editor.create()
+					.then( () => {
+						const spy = sinon.spy( editor, 'syncData' );
+						editor.dom.getSubmitBtn().dispatchEvent( new Event( 'click' ) );
+
+						expect( spy.callCount ).to.equals( 1 );
+					} );
+			} );
+
+			it( 'should add new pending action', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+				const editor = new Editor( GitHubPage.appendRoot() );
+
+				return editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						const spy = sinon.spy( editor, 'syncData' );
+
+						pendingActions.fire( 'change:addAction', 'submit' );
+						editor.dom.getSubmitBtn().dispatchEvent( new Event( 'click' ) );
+
+						expect( spy.callCount ).to.equals( 1 );
+					} );
+			} );
+
+			it( 'should not add new pending action if any action exist', () => {
+				CKEditorConfig.get.returns( { plugins: [ QuoteSelection, PendingActions ] } );
+				const editor = new Editor( GitHubPage.appendRoot() );
+
+				return editor.create()
+					.then( () => {
+						const pendingActions = editor.ckeditor.plugins.get( 'PendingActions' );
+						pendingActions.fire( 'change:addAction', 'submit' );
+
+						const spy = sinon.spy( pendingActions, 'add' );
+
+						editor.dom.getSubmitBtn().dispatchEvent( new Event( 'click' ) );
+
+						expect( spy.callCount ).to.equals( 0 );
+					} );
+			} );
 		} );
 	} );
 } );