Qt: propagate selection from main screen to dialog

Ensure that the selection in main screen is updated on refreshing
interfaces (InterfaceFrame::interfaceListChanged). Add additional
patches to ensure that selection changes from the main screen propagate
to the dialog and be careful to avoid infinite recursions.

Life of a signal for InterfaceFrame:

    ui->interfaceTree->selectionModel emits selectionChanged
    -> slot InterfaceFrame::interfaceTreeSelectionChanged
      -> emits InterfaceFrame::itemSelectionChanged
        -> slot MainWelcome::interfaceSelected
           -> emits MainWelcome::interfacesChanged
              -> slot CaptureInterfacesDialog::interfaceSelected
                 (updats dialog selection)

Life of a signal for CaptureInterfacesDialog:

    ui->interfaceTree emits itemSelectionChanged
    -> slot CaptureInterfacesDialog::interfaceSelected
       (emission of next signal because sender is ui->interfaceTree)
       -> emits CaptureInterfacesDialog::interfacesChanged
          -> slot InterfaceFrame::updateSelectedInterfaces
             (updates main screen selection)

This should probably be updated to model/view with shared selection
model in the future.

Change-Id: Ibb32c201a92bd2f1310523b3e6e63b03209c9ce4
Reviewed-on: https://code.wireshark.org/review/20487
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 1 insertions, 0 deletions

diff --git a/ui/qt/main_welcome.h b/ui/qt/main_welcome.h
index 085983901e..f862154ba6 100644
--- a/ui/qt/main_welcome.h
+++ b/ui/qt/main_welcome.h
@@ -80,6 +80,7 @@ signals:
 #ifdef HAVE_EXTCAP
     void showExtcapOptions(QString &device_name);
 #endif
+    void interfacesChanged();
 
 public slots:
     void setCaptureFilterText(const QString capture_filter);