Commit: 8f49299134b504a59558aad8e66a81ae3c6c9748
Author: Campbell Barton
Date:   Thu Jun 7 20:37:28 2018 +0200
Branches: master
https://developer.blender.org/rB8f49299134b504a59558aad8e66a81ae3c6c9748

WM: fix drag events applying after release

===================================================================

M       source/blender/windowmanager/intern/wm_event_system.c

===================================================================

diff --git a/source/blender/windowmanager/intern/wm_event_system.c 
b/source/blender/windowmanager/intern/wm_event_system.c
index f820a0a1b8d..5974d4fddee 100644
--- a/source/blender/windowmanager/intern/wm_event_system.c
+++ b/source/blender/windowmanager/intern/wm_event_system.c
@@ -2252,9 +2252,14 @@ static int wm_handlers_do(bContext *C, wmEvent *event, 
ListBase *handlers)
                        /* eventstate stores if previous event was a KM_PRESS, 
in case that
                         * wasn't handled, the KM_RELEASE will become a 
KM_CLICK */
 
-                       if (win && event->val == KM_PRESS) {
-                               win->eventstate->check_click = true;
-                               win->eventstate->check_drag = true;
+                       if (win != NULL) {
+                               if (event->val == KM_PRESS) {
+                                       win->eventstate->check_click = true;
+                                       win->eventstate->check_drag = true;
+                               }
+                               else if (event->val == KM_RELEASE) {
+                                       win->eventstate->check_drag = false;
+                               }
                        }
 
                        if (win && win->eventstate->prevtype == event->type) {

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