Fixed a couple of Qt 5.3 problems.

app/SettingsGeneralTab.qml

@@ -133,9 +133,8 @@ Tab{
                     minimumValue: 0
                     onValueChanged: shadersettings.window_scaling = value;
                     value: shadersettings.window_scaling
-                    updateValueWhileDragging: false
                 }
-                Text{text: Math.round(txtslider.__handlePos * 100) + "%"}
+                Text{text: Math.round(txtslider.value * 100) + "%"}
             }
         }
     }

app/main.qml

@@ -30,6 +30,9 @@ ApplicationWindow{
     width: 1024
     height: 768
 
+    minimumWidth: 320
+    minimumHeight: 240
+
     title: qsTr("cool-old-term")
     visible: true
     visibility: shadersettings.fullscreen ? Window.FullScreen : Window.Windowed