From bbf6e2c75c79cb80729eb85baecf4d1a17dd7ed8 Mon Sep 17 00:00:00 2001
From: vsv <vsv@opencascade.com>
Date: Mon, 3 Feb 2020 12:43:59 +0300
Subject: [PATCH] Update viewer after selection clear for OCCT 7.4.0.

---
 src/XGUI/XGUI_SelectionMgr.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/XGUI/XGUI_SelectionMgr.cpp b/src/XGUI/XGUI_SelectionMgr.cpp
index b7c1a65bc..49bcdcbd3 100644
--- a/src/XGUI/XGUI_SelectionMgr.cpp
+++ b/src/XGUI/XGUI_SelectionMgr.cpp
@@ -142,9 +142,14 @@ void XGUI_SelectionMgr::onViewerSelection()
   myLastSelectionPlace = ModuleBase_ISelection::Viewer;
   QList<ModuleBase_ViewerPrsPtr> aValues;
   Handle(AIS_InteractiveContext) aContext = myWorkshop->viewer()->AISContext();
-  if (!aContext.IsNull())
+  if (!aContext.IsNull()) {
     aValues = selection()->getSelected(ModuleBase_ISelection::Viewer);
-
+    // Update is necessary for OCCT 7.4.0: when it is clears selection it doesn't updates viewer
+#if OCC_VERSION_HEX == 0x070400
+    if (aValues.isEmpty())
+      aContext->UpdateCurrentViewer();
+#endif
+  }
   QObjectPtrList anObjects;
   convertToObjectBrowserSelection(aValues, anObjects);
   myWorkshop->objectBrowser()->setObjectsSelected(anObjects);
-- 
2.30.2