Custom setting section not visible if used for admin and personal setting in NC14

[sualko]

In NC 13 everything works as expected, but in NC 14 my admin section is missing (the personal section is there). If I remove the personal-section element, the admin section is there. @juliushaertl thinks this is maybe a bug.

Here's an example of my info.xml:
https://github.com/nextcloud/jsxc.nextcloud/blob/9f342ec4455ad67f9960a152f28894dc22bd3490/appinfo/info.xml#L45-L50

ref jsxc/jsxc#718

Steps to reproduce

1. Use the same section in your info.xml for admin-section and personal-section
2. Go to settings in your NC

Expected behaviour

There is a custom section in personal and admin section.

Actual behaviour

Only the personal section is visible.

Server configuration

Operating system: ubuntu 18.04

Web server: apache

Database: sqlite

PHP version: 7.2

Nextcloud version: 14 beta.4

Updated from an older Nextcloud/ownCloud or fresh install: fresh

Where did you install Nextcloud from: git

Client configuration

Browser: Vivaldi

Operating system: ubuntu 18.04

Logs

Nextcloud log (data/nextcloud.log)

Nextcloud log

Nothing relevant.

Browser log

Browser log

Nothing.

[nextcloud-bot]

GitMate.io thinks possibly related issues are #3490 (Explain some Settings in Personal/Admin Settings), #1063 (Ability to search in Personal and Admin settings), #7578 ('Name' from Theming should not be used in 'Version' in the admin settings), #9003 (Admin settings restructuring), and #5332 (Consider about icon for "Security"-section in personal settings).

[sualko]

I implemented the following workaround, because I want to make my app NC 14 ready. Maybe it's helpful for your debugging. If you have questions, I'm at the NC conf until Monday.

class SectionWorkaround extends Section
{
}

<settings>
      <admin>OCA\OJSXC\Settings\Admin</admin>
      <admin-section>OCA\OJSXC\Settings\Section</admin-section>
      <personal>OCA\OJSXC\Settings\Personal</personal>
      <personal-section>OCA\OJSXC\Settings\SectionWorkaround</personal-section>
</settings>

[sualko]

I think I found the source of this issue:

server/lib/private/Settings/Manager.php

Lines 135 to 137 in 6099786

	public function registerSection(string $type, string $section) {
	$this->sectionClasses[$section] = $type;
	}

As the class is used as key, a section class can't be used for two different section types.

cc @nickvergessen

[nickvergessen]

I do the same "workaround" in the activity app:
https://github.com/nextcloud/activity/blob/master/appinfo/info.xml#L51-L56