[WFS provider] Force refresh of GetCapabilities when pressing Connect

The cached response to GetCapabilities was always used, even when
pressing Connect. Now a new request is sent over the network.

Fixes #15647

Author: rouault

src/providers/wfs/qgswfscapabilities.cpp

@@ -36,7 +36,7 @@ QgsWFSCapabilities::~QgsWFSCapabilities()
 {
 }
 
-bool QgsWFSCapabilities::requestCapabilities( bool synchronous )
+bool QgsWFSCapabilities::requestCapabilities( bool synchronous, bool forceRefresh )
 {
   QUrl url( baseURL() );
   url.addQueryItem( "REQUEST", "GetCapabilities" );
@@ -48,7 +48,7 @@ bool QgsWFSCapabilities::requestCapabilities( bool synchronous )
   else
     url.addQueryItem( "VERSION", version );
 
-  if ( !sendGET( url, synchronous, false ) )
+  if ( !sendGET( url, synchronous, forceRefresh ) )
   {
     emit gotCapabilities();
     return false;

src/providers/wfs/qgswfscapabilities.h

@@ -30,7 +30,7 @@ class QgsWFSCapabilities : public QgsWFSRequest
     virtual ~QgsWFSCapabilities();
 
     //! start network connection to get capabilities
-    bool requestCapabilities( bool synchronous );
+    bool requestCapabilities( bool synchronous, bool forceRefresh );
 
     //! description of a vector layer
     struct FeatureType

src/providers/wfs/qgswfsdataitems.cpp

@@ -62,7 +62,9 @@ QVector<QgsDataItem*> QgsWFSConnectionItem::createChildren()
 
   QgsWFSCapabilities capabilities( mUri );
 
-  capabilities.requestCapabilities( true );
+  const bool synchronous = true;
+  const bool forceRefresh = false;
+  capabilities.requestCapabilities( synchronous, forceRefresh );
 
   QVector<QgsDataItem*> layers;
   if ( capabilities.errorCode() == QgsWFSCapabilities::NoError )

src/providers/wfs/qgswfsprovider.cpp

@@ -1434,7 +1434,9 @@ bool QgsWFSProvider::getCapabilities()
   if ( mShared->mCaps.version.isEmpty() )
   {
     QgsWFSCapabilities getCapabilities( mShared->mURI.uri( false ) );
-    if ( !getCapabilities.requestCapabilities( true ) )
+    const bool synchronous = true;
+    const bool forceRefresh = false;
+    if ( !getCapabilities.requestCapabilities( synchronous, forceRefresh ) )
     {
       QgsMessageLog::logMessage( tr( "GetCapabilities failed for url %1: %2" ).
                                  arg( dataSourceUri() ).arg( getCapabilities.errorMessage() ), tr( "WFS" ) );

src/providers/wfs/qgswfssourceselect.cpp

@@ -354,7 +354,9 @@ void QgsWFSSourceSelect::connectToServer()
   }
   if ( mCapabilities )
   {
-    mCapabilities->requestCapabilities( false );
+    const bool synchronous = false;
+    const bool forceRefresh = true;
+    mCapabilities->requestCapabilities( synchronous, forceRefresh );
   }
 }