Update dangling ends when resizing sheet.

Fixes: lp:1805127
* https://bugs.launchpad.net/kicad/+bug/1805127

eeschema/schedit.cpp

@@ -235,10 +235,6 @@ void SCH_EDIT_FRAME::Process_Special_Functions( wxCommandEvent& event )
 
     case ID_POPUP_SCH_RESIZE_SHEET:
         ReSizeSheet( (SCH_SHEET*) item, nullptr );
-
-        TestDanglingEnds();
-        m_canvas->Refresh();
-
         break;
 
     case ID_POPUP_IMPORT_HLABEL_TO_SHEETPIN:

eeschema/sheet.cpp

@@ -448,6 +448,9 @@ void SCH_EDIT_FRAME::ReSizeSheet( SCH_SHEET* aSheet, wxDC* aDC )
     SetUndoItem( aSheet );
     aSheet->SetFlags( IS_RESIZED );
 
+    std::vector<DANGLING_END_ITEM> emptySet;
+    aSheet->UpdateDanglingState( emptySet );
+
     m_canvas->SetMouseCapture( resizeSheetWithMouseCursor, ExitSheet );
     m_canvas->CallMouseCapture( aDC, wxDefaultPosition, true );