From 41d3b8e362cefd0e733fda4ba7bd38db1fe27bbf Mon Sep 17 00:00:00 2001
From: mpv <mpv@opencascade.com>
Date: Fri, 20 Jul 2018 16:50:04 +0300
Subject: [PATCH] Fix for the problem when referenced object is updated by
 modified-feature result using history line.

An example:
Box
Polyline on a box vertices
Move history to the box
Make another polyline on a box
Move history to the end -> crash
---
 src/Model/Model_Update.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Model/Model_Update.cpp b/src/Model/Model_Update.cpp
index c0a791e26..05a9998d8 100755
--- a/src/Model/Model_Update.cpp
+++ b/src/Model/Model_Update.cpp
@@ -836,7 +836,7 @@ void Model_Update::updateArguments(FeaturePtr theFeature) {
       if (aSelAttr) {
         ObjectPtr aContext = aSelAttr->context();
         // update argument only if the referenced object is ready to use
-        if (aContext.get() && !aContext->isDisabled()) {
+        if (aContext.get() && !aContext->isDisabled() && !aSelAttr->isInvalid()) {
           if (isReason(theFeature, aContext)) {
             if (!aSelAttr->update()) {
               bool isObligatory = !aFactory->isNotObligatory(
@@ -846,7 +846,7 @@ void Model_Update::updateArguments(FeaturePtr theFeature) {
                 aState = ModelAPI_StateInvalidArgument;
             }
           }
-        } else if (aContext.get()) {
+        } else if (aContext.get() || aSelAttr->isInvalid()) {
           // here it may be not obligatory, but if the reference is wrong, it should not be correct
           bool isObligatory = aFactory->isCase(theFeature, theFeature->data()->id(aSel));
           if (isObligatory)
-- 
2.39.2