diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
index a2dddf940576..2453cc51ed92 100644
--- a/src/app/qgisapp.cpp
+++ b/src/app/qgisapp.cpp
@@ -2379,7 +2379,11 @@ int QgisApp::chooseReasonableDefaultIconSize() const
   }
   else
   {
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
     double size = fontMetrics().width( QStringLiteral( "XXX" ) );
+#else
+    double size = fontMetrics().horizontalAdvance( 'X' ) * 3;
+#endif
     if ( size < 24 )
       return 16;
     else if ( size < 32 )
@@ -13625,7 +13629,7 @@ void QgisApp::activateDeactivateLayerRelatedActions( QgsMapLayer *layer )
         mActionAddFeature->setToolTip( addFeatureText );
         QgsGui::shortcutsManager()->unregisterAction( mActionAddFeature );
         if ( !mActionAddFeature->text().isEmpty() ) // The text will be empty on unknown geometry type -> in this case do not create a shortcut
-          QgsGui::shortcutsManager()->registerAction( mActionAddFeature, mActionAddFeature->shortcut() );
+          QgsGui::shortcutsManager()->registerAction( mActionAddFeature, mActionAddFeature->shortcut().toString() );
       }
       else
       {
diff --git a/src/core/auth/qgsauthmanager.cpp b/src/core/auth/qgsauthmanager.cpp
index dc606387e071..d64049ead094 100644
--- a/src/core/auth/qgsauthmanager.cpp
+++ b/src/core/auth/qgsauthmanager.cpp
@@ -2567,7 +2567,10 @@ const QList<QSslCertificate> QgsAuthManager::extraFileCAs()
   // only CAs or certs capable of signing other certs are allowed
   for ( const auto &cert : qgis::as_const( filecerts ) )
   {
-    if ( !allowinvalid.toBool() && !cert.isValid() )
+    if ( !allowinvalid.toBool() && ( cert.isBlacklisted()
+                                     || cert.isNull()
+                                     || cert.expiryDate() <= QDateTime::currentDateTime()
+                                     || cert.effectiveDate() > QDateTime::currentDateTime() ) )
     {
       continue;
     }
diff --git a/src/gui/auth/qgsauthauthoritieseditor.cpp b/src/gui/auth/qgsauthauthoritieseditor.cpp
index 60f516a18109..c3b41179f7fd 100644
--- a/src/gui/auth/qgsauthauthoritieseditor.cpp
+++ b/src/gui/auth/qgsauthauthoritieseditor.cpp
@@ -287,7 +287,11 @@ void QgsAuthAuthoritiesEditor::appendCertsToItem( const QList<QSslCertificate> &
     {
       policy = QgsAuthCertUtils::getCertTrustName( QgsAuthCertUtils::Trusted );
     }
-    else if ( untrustedids.contains( id ) || !cert.isValid() )
+    else if ( untrustedids.contains( id )
+              || cert.isBlacklisted()
+              || cert.isNull()
+              || cert.expiryDate() <= QDateTime::currentDateTime()
+              || cert.effectiveDate() > QDateTime::currentDateTime() )
     {
       policy = QgsAuthCertUtils::getCertTrustName( QgsAuthCertUtils::Untrusted );
     }
@@ -296,7 +300,10 @@ void QgsAuthAuthoritiesEditor::appendCertsToItem( const QList<QSslCertificate> &
     QTreeWidgetItem *item( new QTreeWidgetItem( parent, coltxts, static_cast<int>( catype ) ) );
 
     item->setIcon( 0, QgsApplication::getThemeIcon( QStringLiteral( "/mIconCertificate.svg" ) ) );
-    if ( !cert.isValid() )
+    if ( cert.isBlacklisted()
+         || cert.isNull()
+         || cert.expiryDate() <= QDateTime::currentDateTime()
+         || cert.effectiveDate() > QDateTime::currentDateTime() )
     {
       item->setForeground( 2, redb );
       item->setIcon( 0, QgsApplication::getThemeIcon( QStringLiteral( "/mIconCertificateUntrusted.svg" ) ) );
@@ -305,7 +312,10 @@ void QgsAuthAuthoritiesEditor::appendCertsToItem( const QList<QSslCertificate> &
     if ( trustedids.contains( id ) )
     {
       item->setForeground( 3, greenb );
-      if ( cert.isValid() )
+      if ( !cert.isBlacklisted()
+           && !cert.isNull()
+           && cert.expiryDate() > QDateTime::currentDateTime()
+           && cert.effectiveDate() <= QDateTime::currentDateTime() )
       {
         item->setIcon( 0, QgsApplication::getThemeIcon( QStringLiteral( "/mIconCertificateTrusted.svg" ) ) );
       }
diff --git a/src/plugins/geometry_checker/qgsgeometrycheckerfixsummarydialog.cpp b/src/plugins/geometry_checker/qgsgeometrycheckerfixsummarydialog.cpp
index 05f49a5047de..cfb2791ff369 100644
--- a/src/plugins/geometry_checker/qgsgeometrycheckerfixsummarydialog.cpp
+++ b/src/plugins/geometry_checker/qgsgeometrycheckerfixsummarydialog.cpp
@@ -98,9 +98,9 @@ void QgsGeometryCheckerFixSummaryDialog::setupTable( QTableWidget *table )
 {
   table->resizeColumnToContents( 0 );
   table->resizeColumnToContents( 1 );
-  table->horizontalHeader()->setResizeMode( 2, QHeaderView::Stretch );
-  table->horizontalHeader()->setResizeMode( 3, QHeaderView::Stretch );
-  table->horizontalHeader()->setResizeMode( 4, QHeaderView::Stretch );
+  table->horizontalHeader()->setSectionResizeMode( 2, QHeaderView::Stretch );
+  table->horizontalHeader()->setSectionResizeMode( 3, QHeaderView::Stretch );
+  table->horizontalHeader()->setSectionResizeMode( 4, QHeaderView::Stretch );
   table->setEditTriggers( QAbstractItemView::NoEditTriggers );
   table->setSelectionBehavior( QAbstractItemView::SelectRows );
   table->setSelectionMode( QAbstractItemView::SingleSelection );