Hide existing object when displaying moving preview.

Fixes: lp:1799478
* https://bugs.launchpad.net/kicad/+bug/1799478

eeschema/libedit/pinedit.cpp

@@ -336,8 +336,9 @@ static void DrawMovePin( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aPosi
 
     auto view = parent->GetCanvas()->GetView();
 
+    view->Hide( cur_pin );
     view->ClearPreview();
-    view->AddToPreview( cur_pin, false );
+    view->AddToPreview( cur_pin->Clone() );
 }
 
 

eeschema/libedit/symbdraw.cpp

@@ -47,8 +47,6 @@
 #include <dialogs/dialog_lib_edit_draw_item.h>
 
 
-static void SymbolDisplayDraw( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aPosition,
-                               bool aErase );
 static void RedrawWhileMovingCursor( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aPosition,
                                      bool aErase );
 
@@ -136,7 +134,7 @@ static void AbortSymbolTraceOn( EDA_DRAW_PANEL* aPanel, wxDC* DC )
 LIB_ITEM* LIB_EDIT_FRAME::CreateGraphicItem( LIB_PART* LibEntry, wxDC* DC )
 {
     LIB_ITEM* item = GetDrawItem();
-    m_canvas->SetMouseCapture( SymbolDisplayDraw, AbortSymbolTraceOn );
+    m_canvas->SetMouseCapture( RedrawWhileMovingCursor, AbortSymbolTraceOn );
     wxPoint drawPos = GetCrossHairPosition( true );
 
     // no temp copy -> the current version of symbol will be used for Undo
@@ -262,8 +260,9 @@ static void RedrawWhileMovingCursor( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wx
 
     item->CalcEdit( p );
 
+    view->Hide( item );
     view->ClearPreview();
-    view->AddToPreview( item, false );
+    view->AddToPreview( item->Clone() );
 }
 
 
@@ -299,33 +298,11 @@ void LIB_EDIT_FRAME::StartModifyDrawSymbol( wxDC* DC, LIB_ITEM* aItem )
 
     TempCopyComponent();
     aItem->BeginEdit( IS_RESIZED, GetCrossHairPosition( true ) );
-    m_canvas->SetMouseCapture( SymbolDisplayDraw, AbortSymbolTraceOn );
+    m_canvas->SetMouseCapture( RedrawWhileMovingCursor, AbortSymbolTraceOn );
     m_canvas->CallMouseCapture( DC, wxDefaultPosition, true );
 }
 
 
-//! @brief Manage mouse events when creating new graphic object or modifying an graphic object.
-static void SymbolDisplayDraw( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aPosition,
-                               bool aErase )
-{
-    LIB_ITEM* item = ( (LIB_EDIT_FRAME*) aPanel->GetParent() )->GetDrawItem();
-
-    if( item == NULL )
-        return;
-
-    auto view = static_cast<SCH_DRAW_PANEL*>(aPanel)->GetView();
-
-    auto cp = aPanel->GetParent()->GetCrossHairPosition( true );
-
-    DBG(printf("SymbolDisplayDraw\n");)
-
-    item->CalcEdit( cp );
-
-    view->ClearPreview();
-    view->AddToPreview( item, false );
-}
-
-
 void LIB_EDIT_FRAME::EndDrawGraphicItem( wxDC* DC )
 {
     LIB_ITEM* item = GetDrawItem();

eeschema/sch_painter.cpp

@@ -1058,9 +1058,6 @@ void SCH_PAINTER::draw( SCH_COMPONENT *aComp, int aLayer )
 
     for( auto& item : temp->GetDrawItems() )
     {
-        if( aComp->IsMoving() )
-            item.SetFlags( IS_MOVED );
-
         auto rp = aComp->GetPosition();
         auto ip = item.GetPosition();
         item.Move( wxPoint( rp.x + ip.x, ip.y - rp.y ) );
@@ -1076,7 +1073,7 @@ void SCH_PAINTER::draw( SCH_COMPONENT *aComp, int aLayer )
 
     for( SCH_FIELD* field : fields )
     {
-        if( field->GetId() == REFERENCE || !field->IsMoving() )
+        if( !field->IsMoving() )
             draw( field, aLayer );
     }
 }

eeschema/schedit.cpp

@@ -680,6 +680,7 @@ static void moveItemWithMouseCursor( EDA_DRAW_PANEL* aPanel, wxDC* aDC,
     SCH_SCREEN* screen = (SCH_SCREEN*) aPanel->GetScreen();
     SCH_ITEM*   item   = screen->GetCurItem();
     auto panel = static_cast<SCH_DRAW_PANEL*>( aPanel );
+    auto view = panel->GetView();
 
     wxCHECK_RET( (item != NULL), wxT( "Cannot move invalid schematic item." ) );
 
@@ -688,12 +689,9 @@ static void moveItemWithMouseCursor( EDA_DRAW_PANEL* aPanel, wxDC* aDC,
 
     item->SetPosition( cpos );
 
-    // Draw the item at it's new position.
-    item->SetWireImage();  // While moving, the item may choose to render differently
-
-    auto view = panel->GetView();
+    view->Hide( item );
     view->ClearPreview();
-    view->AddToPreview( item, false );
+    view->AddToPreview( item->Clone() );
 
     // Needed when moving a bitmap image to avoid ugly rendering and artifacts,
     // because a bitmap is drawn only as non cached
@@ -745,7 +743,6 @@ static void abortMoveItem( EDA_DRAW_PANEL* aPanel, wxDC* aDC )
         // Just restore its data
         currentItem->SwapData( oldItem );
 
-        // Erase the wire representation before the 'normal' view is drawn.
         view->Hide( item, false );
 
         item->ClearFlags();
@@ -769,15 +766,17 @@ void SCH_EDIT_FRAME::PrepareMoveItem( SCH_ITEM* aItem )
             SetUndoItem( aItem );
     }
 
+    aItem->SetFlags( IS_MOVED );
+
     if( aItem->Type() == SCH_FIELD_T && aItem->GetParent()->Type() == SCH_COMPONENT_T )
     {
+        RefreshItem( aItem );
+
         // Now that we're moving a field, they're no longer autoplaced.
         SCH_COMPONENT *parent = static_cast<SCH_COMPONENT*>( aItem->GetParent() );
         parent->ClearFieldsAutoplaced();
     }
 
-    aItem->SetFlags( IS_MOVED );
-
     // For some items, moving the cursor to anchor is not good
     // (for instance large hierarchical sheets od componants can have
     // the anchor position outside the canvas)

eeschema/sheet.cpp

@@ -348,8 +348,10 @@ static void resizeSheetWithMouseCursor( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const
 
     auto panel = static_cast<SCH_DRAW_PANEL*>( aPanel );
     auto view = panel->GetView();
+
+    view->Hide( sheet );
     view->ClearPreview();
-    view->AddToPreview( sheet, false );
+    view->AddToPreview( sheet->Clone() );
 }