Admin side menu items hover doesn't work on version 5.5-RC1-48687

[theogk]

When in admin, the hover doesn't work on the menu items on the main left menu. If I click an item, its floating submenu appears instantly but then disappears as the clicked page loads.

[whyisjake]

Hey there @theogk.

I think this is the intended behavior as the entire page is loading in a new page. Since the DOM structure is changing the mouse would need to hover again to bring out the menu.

[theogk]

Is it intended for the hover action to not work? I hover my mouse over a menu item which contains a submenu and nothing happens

[afercia]

@theogk thanks for your first report and welcome to Trac!

I'm not sure I fully understand the issue.
As @whyisjake mentioned above, when you click an item in the left menu, a new page loads and the submenu of the clicked item is then displayed expanded.

Hovering on other menu items shows the fly-out menus for me.

Can you confirm that the bug you're experiencing still exists with the default theme (Twenty Twenty) activated and all plugins deactivated?

[apedog]

Works fine for me.
You should test this issue with no activated plugins and a default theme.
WP admin sub-menus are opened with a script that adds class "opensub" to the parent item.
In some likelihood you have a plugin with a script throwing an error and breaking the menu script.

[theogk]

Found it. It appears to be an issue with WP All Import Pro plugin by Soflyy. When I disable it, hover works again as always. If I enable it and go back to 5.4.3, everything works fine also. The issue only appears on 5.5

I guess someone has to tell them. Sorry if it was a mistake to post this, I just started experimenting with dev versions.

[ocean90]

This sounds like it’s related to [48323] for ​https://make.wordpress.org/core/2020/06/29/updating-jquery-version-shipped-with-wordpress/.

[theogk]

Sounds possible. Just found out screen options ( ​https://prnt.sc/trelk0 ) don't work either. I opened a ticket at Soflyy to check these problems out. Probably there are other plugins out there which will face issues like this in 5.5

[apedog]

Sorry if it was a mistake to post this

It was not a mistake to post this. This is not the only plugin breaking the admin-side's javascript when upgrading to 5.5-RC1

Related: #37110

[afercia]

FWIW, I reported the issue on the WP All Import support forum: ​https://wordpress.org/support/plugin/wp-all-import/

[afercia]

To better clarify: this is what happens on 5.4 where jquery-migrate remediates to the usage of jQuery live()

[afercia]

And this is what happens on 5.5 where the Uncaught TypeError breaks most of the admin functionalities: Media Library grid, Themes page, Plugins page, Widgets page, Menus page, Quick Edit, modals, to name a few.

[mindctrl]

Hi all, since this appears to have been a conflict with another plugin, and we don't have any current reports of this behavior after all these years, I'm going to close this ticket to help clean up the backlog in Trac.

If you're still experiencing this issue, feel free to reopen with details on how to reproduce the bug.