Qt: Fix compilation with Qt 6.4

error: conversion function from 'gchar *' (aka 'char *') to 'QVariant' invokes a deleted function
            return entry->hostname;
                   ^~~~~~~~~~~~~~~
/usr/include/qt6/QtCore/qvariant.h:199:5: note: 'QVariant<char *, false>' has been explicitly marked deleted here
    QVariant(T) = delete;
    ^

ui/qt/models/export_objects_model.cpp

@@ -77,13 +77,13 @@ QVariant ExportObjectModel::data(const QModelIndex &index, int role) const
         case colPacket:
             return QString::number(entry->pkt_num);
         case colHostname:
-            return entry->hostname;
+            return QString::fromUtf8(entry->hostname);
         case colContent:
-            return entry->content_type;
+            return QString::fromUtf8(entry->content_type);
         case colSize:
             return file_size_to_qstring(entry->payload_len);
         case colFilename:
-            return entry->filename;
+            return QString::fromUtf8(entry->filename);
         }
     }
     else if (role == Qt::UserRole)

ui/qt/models/voip_calls_info_model.cpp

@@ -50,9 +50,9 @@ QVariant VoipCallsInfoModel::data(const QModelIndex &index, int role) const
     case InitialSpeaker:
         return address_to_display_qstring(&(call_info->initial_speaker));
     case From:
-        return call_info->from_identity;
+        return QString::fromUtf8(call_info->from_identity);
     case To:
-        return call_info->to_identity;
+        return QString::fromUtf8(call_info->to_identity);
     case Protocol:
         return ((call_info->protocol == VOIP_COMMON) && call_info->protocol_name) ?
             call_info->protocol_name : voip_protocol_name[call_info->protocol];
@@ -99,7 +99,7 @@ QVariant VoipCallsInfoModel::data(const QModelIndex &index, int role) const
             break;
         case VOIP_COMMON:
         default:
-            return call_info->call_comment;
+            return QString::fromUtf8(call_info->call_comment);
         }
     case ColumnCount:
         ws_assert_not_reached();

ui/qt/widgets/filter_expression_toolbar.cpp

@@ -429,7 +429,7 @@ gboolean FilterExpressionToolBar::filter_expression_add_action(const void *key _
         dfb_action->setToolTip(fe->expression);
         dfb_action->setProperty(dfe_property_comment_, QString(fe->expression));
     }
-    dfb_action->setData(fe->expression);
+    dfb_action->setData(QString::fromUtf8(fe->expression));
     dfb_action->setProperty(dfe_property_, true);
     dfb_action->setProperty(dfe_property_label_, QString(fe->label));
     dfb_action->setProperty(dfe_property_expression_, QString(fe->expression));

ui/qt/wireshark_main_window_slots.cpp

@@ -1670,7 +1670,7 @@ void WiresharkMainWindow::addStatsPluginsToMenu() {
             }
 
             stats_tree_action = new QAction(stat_name, this);
-            stats_tree_action->setData(cfg->abbr);
+            stats_tree_action->setData(QString::fromUtf8(cfg->abbr));
             parent_menu->addAction(stats_tree_action);
             connect(stats_tree_action, &QAction::triggered, this, [this]() {
                 QAction* action = qobject_cast<QAction*>(sender());