fix(submenu): ensure submenu has expected width in Safari

Fixes issue where a MenuItem within a submenu with overflow would get cut off and render with a
scroll bar.

fix #7112

src/components/menu/__internal__/submenu/submenu.style.ts

@@ -88,8 +88,13 @@ const StyledSubmenu = styled.ul<StyledSubmenuProps>`
 
       ${submenuMaxWidth &&
       css`
+        width: max-content;
         max-width: ${submenuMaxWidth};
 
+        li {
+          max-width: ${submenuMaxWidth};
+        }
+
         &&& {
           a,
           button,

src/components/menu/__internal__/submenu/submenu.test.tsx

@@ -489,3 +489,23 @@ test("should render the menu with a max-height set when the `maxHeight` prop is
     maxHeight: "80px",
   });
 });
+
+test("should override submenu children's `maxWidth` if `submenuMaxWidth` is set", async () => {
+  const user = userEvent.setup();
+  render(
+    <MenuContext.Provider value={menuContextValues}>
+      <Submenu title="title" submenuMaxWidth="300px">
+        <MenuItem maxWidth="400px">Apple</MenuItem>
+        <MenuItem minWidth="400px">Banana</MenuItem>
+      </Submenu>
+    </MenuContext.Provider>,
+  );
+  const menuItem = screen.getByRole("button", { name: "title" });
+  await user.hover(menuItem);
+  const submenu = screen.getByRole("list");
+  const submenuChildren = screen.getAllByRole("listitem");
+
+  expect(submenu).toHaveStyle({ maxWidth: "300px" });
+  expect(submenuChildren[0]).toHaveStyle({ maxWidth: "300px" });
+  expect(submenuChildren[1]).toHaveStyle({ maxWidth: "300px" });
+});

src/components/menu/menu-item/menu-item.component.tsx

@@ -169,6 +169,7 @@ export const MenuItem = ({
     updateFocusId: updateSubmenuFocusId,
     handleKeyDown: handleSubmenuKeyDown,
     shiftTabPressed,
+    submenuHasMaxWidth,
   } = submenuContext;
   const ref = useRef<HTMLAnchorElement & HTMLButtonElement & HTMLDivElement>(
     null,
@@ -355,7 +356,7 @@ export const MenuItem = ({
         {...elementProps}
         menuItemVariant={variant}
         ariaLabel={ariaLabel}
-        maxWidth={maxWidth}
+        maxWidth={!submenuHasMaxWidth ? itemMaxWidth : undefined}
         inFullscreenView={inFullscreenView}
         asPassiveItem={asPassiveItem}
         placeholderTabIndex={asPassiveItem}

src/components/menu/menu-test.stories.tsx

@@ -267,6 +267,12 @@ export const LongLabelsStory = () => {
         <MenuItem>Child B</MenuItem>
         <MenuItem>Child C</MenuItem>
       </MenuItem>
+      <MenuItem submenu="Parent Menu C with overflow" submenuMaxWidth="300px">
+        <MenuItem minWidth="max-content">
+          Child with a very long label that should wrap onto the next line and
+          not get cut off
+        </MenuItem>
+      </MenuItem>
     </Menu>
   );
 };

src/components/menu/menu.mdx

@@ -86,7 +86,7 @@ import {
 The example below has set the `showDropdownArrow` to false for the MenuItem with a submenu which means no dropdown arrow
 is rendered.
 
-<Canvas of={MenuStories.NoDropdwonArrowOnSubmenuStory} />
+<Canvas of={MenuStories.NoDropdownArrowOnSubmenuStory} />
 
 ### Split submenu into separate component
 
@@ -112,11 +112,11 @@ Note that only one `ScrollableBlock` can be used within a single submenu.
 This is an example of using the `parent` prop of `ScrollableBlock` to render a scrollable sublist of a parent item. The `parentVariant`
 prop can be used to give it a variant that's different from that used in the `ScrollableBlock`.
 
-Note that the result shown here, for those interacting with the page without assisistive technology, is the same as that which
+Note that the result shown here, for those interacting with the page without assistive technology, is the same as that which
 would be produced by leaving out the `parent` prop and putting the `Search` component inside a separate `MenuItem` just before the
 `ScrollableBlock`. However the rendered HTML would be different, with the `ScrollableBlock` becoming a sublist inside its own list
 item that is not connected to the Search - in this example there is a clear semantic relationship between the search input and the
-scrollable list so the `parent` prop should be used to ensure screenreaders make the relationship clear to their users.
+scrollable list so the `parent` prop should be used to ensure screen readers make the relationship clear to their users.
 
 <Canvas of={MenuStories.ScrollableSubmenuWithParent} />
 

src/components/menu/menu.stories.tsx

@@ -330,7 +330,7 @@ export const WithIconStory: Story = () => {
 WithIconStory.storyName = "With Icon";
 WithIconStory.parameters = { chromatic: { disableSnapshot: true } };
 
-export const NoDropdwonArrowOnSubmenuStory: Story = () => {
+export const NoDropdownArrowOnSubmenuStory: Story = () => {
   return (
     <Box minHeight="150px">
       <Menu>
@@ -344,8 +344,8 @@ export const NoDropdwonArrowOnSubmenuStory: Story = () => {
     </Box>
   );
 };
-NoDropdwonArrowOnSubmenuStory.storyName = "No Dropdwon Arrow on Submenu";
-NoDropdwonArrowOnSubmenuStory.parameters = {
+NoDropdownArrowOnSubmenuStory.storyName = "No Dropdown Arrow on Submenu";
+NoDropdownArrowOnSubmenuStory.parameters = {
   chromatic: { disableSnapshot: true },
 };
 
@@ -395,7 +395,7 @@ export const SubmenuIconAndTextAlignment: Story = () => {
     </Box>
   );
 };
-SubmenuIconAndTextAlignment.storyName = "Submeu Icon and Text Alignment";
+SubmenuIconAndTextAlignment.storyName = "Submenu Icon and Text Alignment";
 SubmenuIconAndTextAlignment.parameters = {
   chromatic: { disableSnapshot: true },
 };