I have followed above steps and not able to reproduce this issue.
Here is my system information:

Joomla! Version: Joomla! 3.4.8 Stable [ Ember ] 24-December-2015 19:30 GMT
Joomla! Platform Version: Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
PHP Version: 5.4.45-3+deb.sury.org~precise+1
System Linux desktop

I appreciate you for stepping in @DGT41 :)
However, since the fielduser.js file only injects the click event when the Bootstrap Modal is loaded, there's also a need to modify administrator/components/com_users/views/users/tmpl/modal.php and add:

onclick="if (window.parent && window.parent.jSelectUser) window.parent.jSelectUser(this);"

Wherever the following is encountered:

data-user-field="<?php echo $this->escape($field);?>"

This makes setValue() somehow redundant:

// set the value
$.fieldUser.prototype.setValue = function(value, name) {
    this.$input.val(value).trigger('change');
    this.$inputName.val(name || value).trigger('change');
};

... since the onclick HTML attribute will trigger as well. I can see an isolated issue where jModalClose() is not defined and would make jSelectUser() throw an error. Perhaps changing this:

// handle value select
content.on('click', '.button-select', function(){
    self.setValue($(this).data('user-value'), $(this).data('user-name'));
    self.modalClose();
    $('body').removeClass('modal-open');
});

... to also remove the HTML attribute would solve it when using Bootstrap Modals?

$(this).removeAttr('onclick');

I have tested this item ✅ successfully on 0fe32ce

TEST OK

but please never make me use Hathor again :-P

I have tested this item ✅ successfully on 0fe32ce

RTC

hathor has template overrides for administrator/components/com_users/views/users/tmpl/modal.php (here: https://github.com/joomla/joomla-cms/blob/staging/administrator/templates/hathor/html/com_users/users/modal.php#L66) which calls if (window.parent) window.parent.jSelectUser(this);. If you use any other template, the Modal will fail even after applying this patch.

I thought about that when I was testing and was able to select the user in
com_content before and after the patch when using isis

On 31 March 2016 at 09:54, Octavian Cinciu notifications@github.com wrote:

hathor has template overrides for
administrator/components/com_users/views/users/tmpl/modal.php (here:
https://github.com/joomla/joomla-cms/blob/staging/administrator/templates/hathor/html/com_users/users/modal.php#L66)
which calls if (window.parent) window.parent.jSelectUser(this);. If you
use any other template, the Modal will fail even after applying this patch.

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#9659 (comment)

Brian Teeman
Co-founder Joomla! and OpenSourceMatters Inc.
http://brian.teeman.net/

Isis has layout overrides - fielduser.js takes into account only Bootstrap 2 Modals. Any other Modals (MooTools) and the onclick event won't be triggered. If you'll be using another administrator template (unlikely, but why are we supporting templates if they don't work then?) without a template override for modal.php clicking on a user won't do anything.

Without my proposed changes above this won't be fixed entirely, it will only be fixed for hathor.

Removed RTC

This PR has received new commits.

CC: @brianteeman, @mikeveeckmans

I have tested this item ✅ successfully on d6a8353

TEST OK

Tested successfully:

• Isis works
• Hathor works
• Tested the only free Admin template I've managed to find: https://github.com/sandmanmedia/sandman-control - this one works as well

Set back to RTc - thanks everyone