Launcher: fix some minor glitches in Aircraft list

- updating of 'no results' box
- sizing of the headers when empty
- double-click to select of the search box when focused

src/GUI/AircraftProxyModel.cxx

@@ -51,6 +51,7 @@ void AircraftProxyModel::setAircraftFilterString(QString s)
     }
 
     invalidate();
+    emit countChanged();
 }
 
 int AircraftProxyModel::indexForURI(QUrl uri) const
@@ -79,6 +80,7 @@ void AircraftProxyModel::setRatingFilterEnabled(bool e)
     invalidate();
     emit ratingsFilterEnabledChanged();
     emit summaryTextChanged();
+    emit countChanged();
 }
 
 QString AircraftProxyModel::summaryText() const

src/GUI/LauncherMainWindow.cxx

@@ -18,11 +18,12 @@
 
 // launcher headers
 #include "QtLauncher.hxx"
+#include "AddOnsController.hxx"
+#include "AircraftItemModel.hxx"
 #include "DefaultAircraftLocator.hxx"
 #include "LaunchConfig.hxx"
 #include "LocalAircraftCache.hxx"
 #include "LauncherController.hxx"
-#include "AddOnsController.hxx"
 #include "LocationController.hxx"
 #include "UpdateChecker.hxx"
 

src/GUI/qml/AircraftList.qml

@@ -149,7 +149,7 @@ FocusScope
         Rectangle {
             visible: _launcher.searchAircraftModel.count === 0
             width: aircraftContent.width
-            height: Style.strutSize
+            height: visible ? Style.strutSize : 0
 
             StyledText {
                 anchors.fill: parent
@@ -167,7 +167,7 @@ FocusScope
         Rectangle {
             visible: _launcher.favouriteAircraftModel.count === 0
             width: aircraftContent.width
-            height: Style.strutSize
+            height: visible ? Style.strutSize : 0
 
             StyledText {
                 anchors.fill: parent

src/GUI/qml/SearchButton.qml

@@ -105,6 +105,10 @@ FocusScope
                     buttonText.selectAll();
                 }
             }
+
+            onDoubleClicked: {
+                buttonText.selectAll();
+            }
         }