The ajax loader does not disappear + Better Exposed Filters

Problem/Motivation

When we install Better Exposed Filters 8.x5.0 and Ajax loader 2.0.1 with the unchecked checkbox "Enable fieldset around exposed forms ?" in Exposed form style, the ajax loader work well. When we activate the option "Enable fieldset around exposed forms ?", the ajax loader not disappear.

Steps to reproduce

Install Better Exposed Filters 8.x5.0
Install Ajax loader 2.0.1
Create view with exposed filters
-Use AJAX: Yes
-Exposed form style:
--"Enable fieldset around exposed forms ?": Yes

Ajax loader does not disappear at the end of the request.

Proposed resolution

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Remaining tasks

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User interface changes

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API changes

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Data model changes

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