Disable start new test button instead of hiding it.

When acting as another user, disable the "Start New Test" button
instead of hiding it if user doesn't have permission to start a
test as a different user.  Include a tooltip that states why the
button is disabled.

lib/WeBWorK/ContentGenerator/ProblemSet.pm

@@ -48,7 +48,7 @@ async sub initialize ($c) {
 	my $eUserID = $c->param('effectiveUser');
 
 	# Don't show "Start New Test" button when acting as another user, unless user has permissions to do so.
-	$c->{hide_start_new_test} = $userID ne $eUserID
+	$c->{disable_start_new_test} = $userID ne $eUserID
 		&& !($authz->hasPermissions($userID, 'record_answers_when_acting_as_student')
 			|| $authz->hasPermissions($userID, 'create_new_set_version_when_acting_as_student'));
 

templates/ContentGenerator/ProblemSet/version_list.html.ep

@@ -126,13 +126,20 @@
 		<div class="alert alert-warning"><%= maketext('This test requires a proctor password to start.') %></div>
 	% }
 	%
-	% # Hide "Start New Test" button when acting as another use who doesn't have permissions to start test.
-	% unless ($c->{hide_start_new_test}) {
-		<div class="mb-3">
-			<%= link_to maketext('Start New Test') => $c->systemLink(url_for($routeName, setID => $set->set_id)),
-				class => 'btn btn-primary' =%>
-		</div>
+	<div class="mb-3">
+	% # Disable "Start New Test" button when acting as another user who doesn't have permissions to start tests.
+	% if ($c->{disable_start_new_test}) {
+		<span class="d-inline-block set-id-tooltip" tabindex="0" data-bs-toggle="tooltip" data-bs-placement="top"
+			data-bs-title="<%=maketext(
+				'You are acting as another user and do not have permission to start a new test for other users.'
+			) %>">
+			<button class="btn btn-primary" type="button" disabled><%= maketext('Start New Test') %></button>
+		</span>
+	% } else {
+		<%= link_to maketext('Start New Test') => $c->systemLink(url_for($routeName, setID => $set->set_id)),
+			class => "btn btn-primary" =%>
 	% }
+	</div>
 % } else {
 	% # Message about if/when next version will be available.
 	% my $msg = maketext('No more tests available.');