Fix grid selection issue when starting Eeschema or Gerbview:

Eeschema (also Libedit and Libview) starts always to the default grid (50 mils)
Gerbview starts with the last selected grid, but the validity is tested.
In Pcbnew the grid value is always displayed, so it should always be good.

eeschema/libeditframe.cpp

@@ -204,6 +204,7 @@ LIB_EDIT_FRAME::LIB_EDIT_FRAME( SCH_EDIT_FRAME* aParent,
     m_tempCopyComponent   = NULL;
     m_HotkeysZoomAndGridList = s_Libedit_Hokeys_Descr;
     m_editPinsPerPartOrConvert = false;
+    m_LastGridSizeId = ID_POPUP_GRID_LEVEL_50 - ID_POPUP_GRID_LEVEL_1000;
 
     wxIcon icon;
 
@@ -219,12 +220,10 @@ LIB_EDIT_FRAME::LIB_EDIT_FRAME( SCH_EDIT_FRAME* aParent,
 
     LoadSettings();
 
-    // Initialize grid id to a default value if not found in config or bad:
-    if( (m_LastGridSizeId <= 0)
-       || ( m_LastGridSizeId < (ID_POPUP_GRID_USER - ID_POPUP_GRID_LEVEL_1000) ) )
-        m_LastGridSizeId = ID_POPUP_GRID_LEVEL_50 - ID_POPUP_GRID_LEVEL_1000;
-
     SetSize( m_FramePos.x, m_FramePos.y, m_FrameSize.x, m_FrameSize.y );
+
+    // Initialize grid id to the default value 50 mils:
+    m_LastGridSizeId = ID_POPUP_GRID_LEVEL_50 - ID_POPUP_GRID_LEVEL_1000;
     GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId  );
 
     if( m_canvas )

eeschema/schframe.cpp

@@ -216,11 +216,8 @@ SCH_EDIT_FRAME::SCH_EDIT_FRAME( wxWindow*       father,
     /* Get config */
     LoadSettings();
 
-    // Initialize grid id to a default value if not found in config or bad:
-    if( (m_LastGridSizeId <= 0)
-       || ( m_LastGridSizeId < (ID_POPUP_GRID_USER - ID_POPUP_GRID_LEVEL_1000) ) )
+    // Initialize grid id to the default value (50 mils):
     m_LastGridSizeId = ID_POPUP_GRID_LEVEL_50 - ID_POPUP_GRID_LEVEL_1000;
-
     SetSize( m_FramePos.x, m_FramePos.y, m_FrameSize.x, m_FrameSize.y );
 
     if( m_canvas )

eeschema/viewlib_frame.cpp

@@ -130,6 +130,9 @@ LIB_VIEW_FRAME::LIB_VIEW_FRAME( wxWindow* father, CMP_LIBRARY* Library, wxSemaph
     LoadSettings();
 
     SetSize( m_FramePos.x, m_FramePos.y, m_FrameSize.x, m_FrameSize.y );
+
+    // Initialize grid id to the default value (50 mils):
+    m_LastGridSizeId = ID_POPUP_GRID_LEVEL_50 - ID_POPUP_GRID_LEVEL_1000;
     GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId  );
 
     ReCreateHToolbar();

gerbview/gerbview_frame.cpp

@@ -107,6 +107,11 @@ GERBVIEW_FRAME::GERBVIEW_FRAME( wxWindow*       father,
     // initialize parameters in m_LayersManager
     LoadSettings();
     SetSize( m_FramePos.x, m_FramePos.y, m_FrameSize.x, m_FrameSize.y );
+
+    if( m_LastGridSizeId < ID_POPUP_GRID_LEVEL_1000 )
+        m_LastGridSizeId = m_LastGridSizeId;
+    if( m_LastGridSizeId > ID_POPUP_GRID_LEVEL_0_0_1MM )
+        m_LastGridSizeId = ID_POPUP_GRID_LEVEL_0_0_1MM
     GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId  );
 
     ReCreateMenuBar();