Fixed pcbnew crash when a locked footprint is dragged from an edge of the screen.

common/view/wx_view_controls.cpp

@@ -240,7 +240,7 @@ void WX_VIEW_CONTROLS::onTimer( wxTimerEvent& aEvent )
 #if wxCHECK_VERSION( 3, 0, 0 )
         moveEvent.SetControlDown( wxGetKeyState( WXK_CONTROL ) );
         moveEvent.SetShiftDown( wxGetKeyState( WXK_SHIFT ) );
-        moveEvent.SetAltDown( wxGetKeyState( WXK_ALT) );
+        moveEvent.SetAltDown( wxGetKeyState( WXK_ALT ) );
 #else
         // wx <3.0 do not have accessors, but the fields are exposed
         moveEvent.m_controlDown = wxGetKeyState( WXK_CONTROL );

pcbnew/tools/edit_tool.cpp

@@ -102,7 +102,6 @@ int EDIT_TOOL::Main( TOOL_EVENT& aEvent )
     PCB_BASE_EDIT_FRAME* editFrame = getEditFrame<PCB_BASE_EDIT_FRAME>();
     controls->ShowCursor( true );
     controls->SetSnapping( true );
-    controls->SetAutoPan( true );
     controls->ForceCursorPosition( false );
 
     // Main loop: keep receiving events
@@ -159,7 +158,7 @@ int EDIT_TOOL::Main( TOOL_EVENT& aEvent )
             }
             else    // Prepare to start dragging
             {
-                if( m_selectionTool->CheckLock() )
+                if( m_selectionTool->CheckLock() || selection.Empty() )
                     break;
 
                 // Save items, so changes can be undone
@@ -188,6 +187,7 @@ int EDIT_TOOL::Main( TOOL_EVENT& aEvent )
                                                          wxPoint( origin.x, origin.y );
                 }
 
+                controls->SetAutoPan( true );
                 m_dragging = true;
             }