Don't paint hidden fields without a schematic context

eeschema/dialogs/panel_eeschema_color_settings.cpp

@@ -215,6 +215,9 @@ void PANEL_EESCHEMA_COLOR_SETTINGS::createSwatches()
     m_preview->ShowScrollbars( wxSHOW_SB_NEVER, wxSHOW_SB_NEVER );
     m_preview->GetGAL()->SetAxesEnabled( false );
 
+    KIGFX::SCH_RENDER_SETTINGS* settings = m_preview->GetRenderSettings();
+    settings->m_IsSymbolEditor = true;
+
     m_colorsMainSizer->Add( 10, 0, 0, wxEXPAND, 5 );
     m_colorsMainSizer->Add( m_preview, 1, wxALL | wxEXPAND, 5 );
     m_colorsMainSizer->Add( 10, 0, 0, wxEXPAND, 5 );

eeschema/sch_painter.cpp

@@ -869,7 +869,7 @@ void SCH_PAINTER::draw( const LIB_FIELD *aField, int aLayer )
 
     if( !( aField->IsVisible() || aField->IsForceVisible() ) )
     {
-        if( !m_schematic || eeconfig()->m_Appearance.show_hidden_fields )
+        if( m_schSettings.m_IsSymbolEditor || eeconfig()->m_Appearance.show_hidden_fields )
             color = getRenderColor( aField, LAYER_HIDDEN, drawingShadows );
         else
             return;

eeschema/sch_preview_panel.cpp

@@ -54,7 +54,7 @@ SCH_PREVIEW_PANEL::SCH_PREVIEW_PANEL( wxWindow* aParentWindow, wxWindowID aWindo
 
     m_painter.reset( new KIGFX::SCH_PAINTER( m_gal ) );
 
-    auto* renderSettings = static_cast<KIGFX::SCH_RENDER_SETTINGS*>( m_painter->GetSettings() );
+    KIGFX::SCH_RENDER_SETTINGS* renderSettings = GetRenderSettings();
     renderSettings->LoadColors( Pgm().GetSettingsManager().GetColorSettings() );
     renderSettings->m_ShowPinsElectricalType = false;
     renderSettings->m_TextOffsetRatio = 0.35;
@@ -89,6 +89,12 @@ SCH_PREVIEW_PANEL::~SCH_PREVIEW_PANEL()
 }
 
 
+KIGFX::SCH_RENDER_SETTINGS* SCH_PREVIEW_PANEL::GetRenderSettings() const
+{
+    return static_cast<KIGFX::SCH_RENDER_SETTINGS*>( m_painter->GetSettings() );
+}
+
+
 void SCH_PREVIEW_PANEL::OnShow()
 {
     //m_view->RecacheAllItems();

eeschema/sch_preview_panel.h

@@ -29,6 +29,7 @@
 
 
 namespace KIGFX {
+    class SCH_RENDER_SETTINGS;
     class SCH_VIEW;
     namespace PREVIEW {
         class SELECTION_AREA;
@@ -51,6 +52,8 @@ public:
     /// @copydoc wxWindow::Refresh()
     void Refresh( bool aEraseBackground, const wxRect* aRect ) override;
 
+    KIGFX::SCH_RENDER_SETTINGS* GetRenderSettings() const;
+
 
 protected: