Adjust minimum application window size

src/ui/MainRootWindow.qml

@@ -25,8 +25,8 @@ import QGroundControl.FlightMap     1.0
 /// All properties defined here are visible to all QML pages.
 ApplicationWindow {
     id:             mainWindow
-    minimumWidth:   ScreenTools.isMobile ? Screen.width  : Math.min(215 * Screen.pixelDensity, Screen.width)
-    minimumHeight:  ScreenTools.isMobile ? Screen.height : Math.min(120 * Screen.pixelDensity, Screen.height)
+    minimumWidth:   ScreenTools.isMobile ? Screen.width  : Math.min(ScreenTools.defaultFontPixelWidth * 100, Screen.width)
+    minimumHeight:  ScreenTools.isMobile ? Screen.height : Math.min(ScreenTools.defaultFontPixelWidth * 50, Screen.height)
     visible:        true
 
     Component.onCompleted: {