Gui: Do not accept changes when pressing ESC key in 3D view

Forward the ESC key event to the Task view to reject changes if needed. This fixes issue https://github.com/FreeCAD/FreeCAD/issues/23504

src/Gui/ViewProvider.cpp

@@ -23,6 +23,7 @@
 
 
 # include <QApplication>
+# include <QKeyEvent>
 # include <QTimer>
 # include <Inventor/SoPickedPoint.h>
 # include <Inventor/actions/SoGetBoundingBoxAction.h>
@@ -48,6 +49,7 @@
 #include "Application.h"
 #include "BitmapFactory.h"
 #include "Document.h"
+#include "DockWindowManager.h"
 #include "SoFCDB.h"
 #include "View3DInventor.h"
 #include "View3DInventorViewer.h"
@@ -234,6 +236,12 @@ void ViewProvider::eventCallback(void * ud, SoEventCallback * node)
                             }
                         }
 
+                        DockWindowManager* pDockMgr = DockWindowManager::instance();
+                        if (QWidget* widget = pDockMgr->getDockWindow("Tasks")) {
+                            QKeyEvent ev(QEvent::KeyPress, Qt::Key_Escape, Qt::NoModifier);
+                            qApp->sendEvent(widget, &ev);
+                        }
+
                         auto func = new Gui::TimerFunction();
                         func->setAutoDelete(true);
                         func->setFunction([doc]() {