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Affected Branches:
MOODLE_400_STABLE
Testing Instructions:

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Reproduction steps:

1. Install my version of format_topics https://github.com/frederikmillingpytlick/format_topics/tree/import-jquery-ui (the import-jquery-ui branch)
2. Install this chrome extension to consistently reproduce the error: https://chrome.google.com/webstore/detail/url-throttler/kpkeghonflnkockcnaegmphgdldfnden
3. Configure the chrome extension with a delay of 15000, add this URL: "*://*/lib/javascript.php/*/lib/jquery/ui*" and enable it.
4. Open a course with the topics format and wait 20-25 seconds to make sure everything is loaded.
5. The drawers should no longer work, because jqueryui is loaded after bootstrap's javascript.

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Reproduction steps: 1. Install my version of format_topics https://github.com/frederikmillingpytlick/format_topics/tree/import-jquery-ui (the import-jquery-ui branch) 2. Install this chrome extension to consistently reproduce the error: https://chrome.google.com/webstore/detail/url-throttler/kpkeghonflnkockcnaegmphgdldfnden 3. Configure the chrome extension with a delay of 15000, add this URL: "*://*/lib/javascript.php/*/lib/jquery/ui*" and enable it. 4. Open a course with the topics format and wait 20-25 seconds to make sure everything is loaded. 5. The drawers should no longer work, because jqueryui is loaded after bootstrap's javascript.

The drawers are unable to be collapsed/uncollapsed and the same console errors appear.

It occurs because we import jqueryui in our course format plugin. If jqueryui is loaded after bootstrap's javascript it breaks the drawers.

has a non-specific relationship to

MDL-74459 Toggling course index/drawer broken, JS errors within some course/module pages

is duplicated by

MDL-84494 Tooltip hang

Participants:: Andrew Lyons, Frederik Milling Pytlick, Stefan L, Ulrik McArdle