Added hint on dopdown shortcut under Wayland (#1151)

* Added hint on dopdown shortcut under Wayland

… to Terminal settings → Dropdown → Shortcut.

* Changed the label text

src/forms/propertiesdialog.ui

@@ -982,6 +982,16 @@ To remove/disable a Shortcut, at point 2 press only a modifier (like Shift)</str
          </item>
         </layout>
        </item>
+       <item>
+        <widget class="QLabel" name="waylandLabel">
+         <property name="text">
+          <string>Note: On Wayland, the shortcut has to be added in the compositor settings for 'qterminal -d'.</string>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
        <item>
         <spacer name="verticalSpacer_5">
          <property name="orientation">

src/propertiesdialog.cpp

@@ -290,6 +290,8 @@ PropertiesDialog::PropertiesDialog(QWidget *parent)
         Properties::Instance()->saveSettings();
     });
 
+    waylandLabel->setVisible(QGuiApplication::platformName() == QStringLiteral("wayland"));
+
     // restore its size while fitting it into available desktop geometry
     QSize s;
     if (!Properties::Instance()->prefDialogSize.isEmpty())