Fixed a memleak in GerbView

Changed m_painter PAINTER* to unique_ptr<PAINTER> to avoid confusion
regarding the objection destruction.

gerbview/gerbview_draw_panel_gal.cpp

@@ -38,8 +38,8 @@ EDA_DRAW_PANEL_GAL( aParentWindow, aWindowId, aPosition, aSize, aOptions, aGalTy
 {
     setDefaultLayerDeps();
 
-    m_painter = new KIGFX::GERBVIEW_PAINTER( m_gal );
-    m_view->SetPainter( m_painter );
+    m_painter.reset( new KIGFX::GERBVIEW_PAINTER( m_gal ) );
+    m_view->SetPainter( m_painter.get() );
 
     // Load display options (such as filled/outline display of items).
     auto frame = static_cast< GERBVIEW_FRAME* >( GetParentEDAFrame() );

include/class_draw_panel_gal.h

@@ -35,6 +35,7 @@
 #include <wx/timer.h>
 #include <math/vector2d.h>
 #include <msgpanel.h>
+#include <memory>
 
 class BOARD;
 class EDA_DRAW_FRAME;
@@ -271,7 +272,7 @@ protected:
     KIGFX::VIEW*             m_view;
 
     /// Contains information about how to draw items using GAL
-    KIGFX::PAINTER*          m_painter;
+    std::unique_ptr<KIGFX::PAINTER> m_painter;
 
     /// Control for VIEW (moving, zooming, etc.)
     KIGFX::WX_VIEW_CONTROLS* m_viewControls;

pcbnew/pcb_draw_panel_gal.cpp

@@ -107,8 +107,8 @@ EDA_DRAW_PANEL_GAL( aParentWindow, aWindowId, aPosition, aSize, aOptions, aGalTy
     setDefaultLayerOrder();
     setDefaultLayerDeps();
 
-    m_painter = new KIGFX::PCB_PAINTER( m_gal );
-    m_view->SetPainter( m_painter );
+    m_painter.reset( new KIGFX::PCB_PAINTER( m_gal ) );
+    m_view->SetPainter( m_painter.get() );
 
     // Load display options (such as filled/outline display of items).
     // Can be made only if the parent window is an EDA_DRAW_FRAME (or a derived class)
@@ -125,7 +125,6 @@ EDA_DRAW_PANEL_GAL( aParentWindow, aWindowId, aPosition, aSize, aOptions, aGalTy
 
 PCB_DRAW_PANEL_GAL::~PCB_DRAW_PANEL_GAL()
 {
-    delete m_painter;
 }