Make buttons visible only on hover over container

Make some buttons visible only when hovering over it's container.

Applied to: adm_config_report.php, view.php (bugnotes)

Fixes: #22872

adm_config_report.php

@@ -426,7 +426,7 @@ function check_config_value( $p_config ) {
 
 ?>
 <!-- Repeated Info Rows -->
-			<tr>
+			<tr class="visible-on-hover-toggle">
 				<td>
 					<?php echo ($v_user_id == 0) ? lang_get( 'all_users' ) : string_display_line( user_get_name( $v_user_id ) ) ?>
 				</td>
@@ -439,7 +439,7 @@ function check_config_value( $p_config ) {
 	if( $t_read_write_access ) {
 ?>
 <td class="center">
-	<div class="btn-group inline">
+	<div class="btn-group inline visible-on-hover">
 <?php
 		if( config_can_delete( $v_config_id ) ) {
 			# Update button (will populate edit form at page bottom)

bugnote_view_inc.php

@@ -153,7 +153,7 @@
 			$t_time_tracking_hhmm = '';
 		}
 ?>
-<tr class="bugnote" id="c<?php echo $t_activity['id'] ?>">
+<tr class="bugnote visible-on-hover-toggle" id="c<?php echo $t_activity['id'] ?>">
 		<td class="category">
 		<div class="pull-left padding-2"><?php print_avatar( $t_activity['user_id'], 'bugnote', 80 ); ?>
 		</div>
@@ -199,7 +199,7 @@
 		?>
 		<div class="clearfix"></div>
 		<div class="space-2"></div>
-		<div class="btn-group-sm">
+		<div class="btn-group visible-on-hover">
 		<?php
 			# show edit button if the user is allowed to edit this bugnote
 			if( $t_activity['can_edit'] ) {

js/common.js

@@ -378,6 +378,21 @@ $(document).ready( function() {
 	$(document).on('shown.bs.dropdown', '#dropdown_projects_menu', function() {
 		$(this).find(".dropdown-menu li.active a").focus();
 	 });
+
+	/**
+	 * Manage visiblity on hover trigger objects
+	 */
+	if( $('.visible-on-hover-toggle').length ) {
+		$('.visible-on-hover-toggle').hover(
+			function(e){ // handlerIn
+				$(e.currentTarget).find('.visible-on-hover').removeClass('invisible');
+			},
+			function(e){ // handlerOut
+				$(e.currentTarget).find('.visible-on-hover').addClass('invisible');
+			}
+		);
+		$('.visible-on-hover').addClass('invisible');
+	}
 });
 
 function setBugLabel() {