MM-56705 Don't send post when clicking on the more formatting options button (#26090)

webapp/channels/src/components/advanced_text_editor/formatting_bar/formatting_bar.test.tsx

@@ -0,0 +1,86 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {screen} from '@testing-library/react';
+import React from 'react';
+
+import {renderWithContext, userEvent} from 'tests/react_testing_utils';
+import {Locations} from 'utils/constants';
+
+import FormattingBar from './formatting_bar';
+import * as Hooks from './hooks';
+
+global.ResizeObserver = require('resize-observer-polyfill');
+
+jest.mock('./hooks');
+
+const {splitFormattingBarControls} = jest.requireActual('./hooks');
+
+describe('FormattingBar', () => {
+    const baseProps = {
+        getCurrentMessage: jest.fn(() => ''),
+        getCurrentSelection: jest.fn(() => ({start: 0, end: 0})),
+        applyMarkdown: jest.fn(),
+        disableControls: false,
+        location: Locations.CENTER,
+    };
+
+    test('should render hidden formatting button when screen size is min', () => {
+        jest.spyOn(Hooks, 'useFormattingBarControls').mockReturnValue({wideMode: 'min', ...splitFormattingBarControls('min')});
+
+        renderWithContext(
+            <FormattingBar {...baseProps}/>,
+        );
+
+        expect(screen.getByLabelText('show hidden formatting options')).toBeInTheDocument();
+    });
+
+    test('should render hidden formatting button when screen size is narrow', () => {
+        jest.spyOn(Hooks, 'useFormattingBarControls').mockReturnValue({wideMode: 'narrow', ...splitFormattingBarControls('narrow')});
+
+        renderWithContext(
+            <FormattingBar {...baseProps}/>,
+        );
+
+        expect(screen.getByLabelText('show hidden formatting options')).toBeInTheDocument();
+    });
+
+    test('should render hidden formatting button when screen size is normal', () => {
+        jest.spyOn(Hooks, 'useFormattingBarControls').mockReturnValue({wideMode: 'normal', ...splitFormattingBarControls('normal')});
+
+        renderWithContext(
+            <FormattingBar {...baseProps}/>,
+        );
+
+        expect(screen.getByLabelText('show hidden formatting options')).toBeInTheDocument();
+    });
+
+    test('should not render hidden formatting button when screen size is wide', () => {
+        jest.spyOn(Hooks, 'useFormattingBarControls').mockReturnValue({wideMode: 'wide', ...splitFormattingBarControls('wide')});
+
+        renderWithContext(
+            <FormattingBar {...baseProps}/>,
+        );
+
+        expect(screen.queryByLabelText('show hidden formatting options')).not.toBeInTheDocument();
+    });
+
+    test('MM-56705 should not submit form when clicking on hidden formatting button', () => {
+        jest.spyOn(Hooks, 'useFormattingBarControls').mockReturnValue({wideMode: 'narrow', ...splitFormattingBarControls('narrow')});
+
+        const onSubmit = jest.fn();
+
+        renderWithContext(
+            <form onSubmit={onSubmit}>
+                <FormattingBar {...baseProps}/>
+            </form>,
+        );
+
+        expect(screen.queryByLabelText('heading')).not.toBeVisible();
+
+        userEvent.click(screen.getByLabelText('show hidden formatting options'));
+
+        expect(screen.queryByLabelText('heading')).toBeVisible();
+        expect(onSubmit).not.toHaveBeenCalled();
+    });
+});

webapp/channels/src/components/advanced_text_editor/formatting_bar/formatting_bar.tsx

@@ -243,6 +243,7 @@ const FormattingBar = (props: FormattingBarProps): JSX.Element => {
                         ref={setReference}
                         className={classNames({active: showHiddenControls})}
                         aria-label={HiddenControlsButtonAriaLabel}
+                        type='button'
                         {...getClickReferenceProps()}
                         {...getDismissReferenceProps()}
                     >

webapp/channels/src/components/advanced_text_editor/formatting_bar/hooks.tsx

@@ -56,6 +56,20 @@ const MAP_WIDE_MODE_TO_CONTROLS_QUANTITY: {[key in WideMode]: number} = {
     min: 1,
 };
 
+export function splitFormattingBarControls(wideMode: WideMode) {
+    const allControls: MarkdownMode[] = ['bold', 'italic', 'strike', 'heading', 'link', 'code', 'quote', 'ul', 'ol'];
+
+    const controlsLength = MAP_WIDE_MODE_TO_CONTROLS_QUANTITY[wideMode];
+
+    const controls = allControls.slice(0, controlsLength);
+    const hiddenControls = allControls.slice(controlsLength);
+
+    return {
+        controls,
+        hiddenControls,
+    };
+}
+
 export const useFormattingBarControls = (
     formattingBarRef: React.RefObject<HTMLDivElement>,
 ): {
@@ -65,12 +79,7 @@ export const useFormattingBarControls = (
 } => {
     const wideMode = useResponsiveFormattingBar(formattingBarRef);
 
-    const allControls: MarkdownMode[] = ['bold', 'italic', 'strike', 'heading', 'link', 'code', 'quote', 'ul', 'ol'];
+    const {controls, hiddenControls} = splitFormattingBarControls(wideMode);
-
-    const controlsLength = MAP_WIDE_MODE_TO_CONTROLS_QUANTITY[wideMode];
-
-    const controls = allControls.slice(0, controlsLength);
-    const hiddenControls = allControls.slice(controlsLength);
 
     return {
         controls,