From 501327d2c57f3a15a2156f7efdc65f3462cb04c5 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 4 Sep 2017 22:51:22 +0200
Subject: [PATCH] do not clear selection when clicking on empty space while
 Ctrl key is pressed

---
 src/Gui/SoFCUnifiedSelection.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Gui/SoFCUnifiedSelection.cpp b/src/Gui/SoFCUnifiedSelection.cpp
index 87321a05c5..888c0dbfea 100644
--- a/src/Gui/SoFCUnifiedSelection.cpp
+++ b/src/Gui/SoFCUnifiedSelection.cpp
@@ -539,6 +539,15 @@ SoFCUnifiedSelection::handleEvent(SoHandleEventAction * action)
                     this->touch();
                 }
             } // picked point
+            else if (!pp) {
+                // user clicked onto empty space but in case Ctrl key was pressed
+                // then mark the action as handled to avoid that the navigation style
+                // processes the action and clears the selection
+                if (event->wasCtrlDown()) {
+                    action->setHandled();
+                }
+
+            }
         } // mouse release
     }