System classes must not have the CS_GLOBALCLASS style.

controls/button.c

@@ -104,7 +104,7 @@ static WORD checkBoxWidth = 0, checkBoxHeight = 0;
 const struct builtin_class_descr BUTTON_builtin_class =
 {
     "Button",            /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
+    CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
     ButtonWndProcA,      /* procA */
     ButtonWndProcW,      /* procW */
     NB_EXTRA_BYTES,      /* extra */

controls/combo.c

@@ -83,7 +83,7 @@ static LRESULT WINAPI ComboWndProcW( HWND hwnd, UINT msg, WPARAM wParam, LPARAM
 const struct builtin_class_descr COMBO_builtin_class =
 {
     "ComboBox",           /* name */
-    CS_GLOBALCLASS | CS_PARENTDC | CS_DBLCLKS, /* style  */
+    CS_PARENTDC | CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW, /* style  */
     ComboWndProcA,        /* procA */
     ComboWndProcW,        /* procW */
     sizeof(HEADCOMBO *),  /* extra */

controls/desktop.c

@@ -48,7 +48,7 @@ static LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LP
 const struct builtin_class_descr DESKTOP_builtin_class =
 {
     DESKTOP_CLASS_ATOM,   /* name */
-    CS_GLOBALCLASS,       /* style */
+    CS_DBLCLKS,           /* style */
     NULL,                 /* procA (winproc is Unicode only) */
     DesktopWndProc,       /* procW */
     0,                    /* extra */

controls/edit.c

@@ -285,7 +285,7 @@ LRESULT WINAPI EditWndProcW(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 const struct builtin_class_descr EDIT_builtin_class =
 {
     "Edit",               /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS | CS_PARENTDC,   /* style */
+    CS_DBLCLKS | CS_PARENTDC,   /* style */
     EditWndProcA,         /* procA */
     EditWndProcW,         /* procW */
     sizeof(EDITSTATE *),  /* extra */

controls/icontitle.c

@@ -47,7 +47,7 @@ static LRESULT WINAPI IconTitleWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPAR
 const struct builtin_class_descr ICONTITLE_builtin_class =
 {
     ICONTITLE_CLASS_ATOM, /* name */
-    CS_GLOBALCLASS,       /* style */
+    0,                    /* style */
     NULL,                 /* procA (winproc is Unicode only) */
     IconTitleWndProc,     /* procW */
     0,                    /* extra */

controls/listbox.c

@@ -139,7 +139,7 @@ static LRESULT LISTBOX_GetItemRect( LB_DESCR *descr, INT index, RECT *rect );
 const struct builtin_class_descr LISTBOX_builtin_class =
 {
     "ListBox",            /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS /*| CS_PARENTDC*/,  /* style */
+    CS_DBLCLKS /*| CS_PARENTDC*/,  /* style */
     ListBoxWndProcA,      /* procA */
     ListBoxWndProcW,      /* procW */
     sizeof(LB_DESCR *),   /* extra */
@@ -154,7 +154,7 @@ const struct builtin_class_descr LISTBOX_builtin_class =
 const struct builtin_class_descr COMBOLBOX_builtin_class =
 {
     "ComboLBox",          /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS | CS_SAVEBITS,  /* style */
+    CS_DBLCLKS | CS_SAVEBITS,  /* style */
     ComboLBWndProcA,      /* procA */
     ComboLBWndProcW,      /* procW */
     sizeof(LB_DESCR *),   /* extra */

controls/menu.c

@@ -184,7 +184,7 @@ DWORD WINAPI DrawMenuBarTemp(HWND hwnd, HDC hDC, LPRECT lprect, HMENU hMenu, HFO
 const struct builtin_class_descr MENU_builtin_class =
 {
     POPUPMENU_CLASS_ATOMA,         /* name */
-    CS_GLOBALCLASS | CS_SAVEBITS,  /* style */
+    CS_DROPSHADOW | CS_SAVEBITS | CS_DBLCLKS,  /* style */
     NULL,                          /* procA (winproc is Unicode only) */
     PopupMenuWndProc,              /* procW */
     sizeof(HMENU),                 /* extra */

controls/scroll.c

@@ -132,7 +132,7 @@ static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPA
 const struct builtin_class_descr SCROLL_builtin_class =
 {
     "ScrollBar",            /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
+    CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
     NULL,                   /* procA (winproc is Unicode only) */
     ScrollBarWndProc,       /* procW */
     sizeof(SCROLLBAR_INFO), /* extra */

controls/static.c

@@ -80,7 +80,7 @@ static pfPaint staticPaintFunc[SS_TYPEMASK+1] =
 const struct builtin_class_descr STATIC_builtin_class =
 {
     "Static",            /* name */
-    CS_GLOBALCLASS | CS_DBLCLKS | CS_PARENTDC, /* style  */
+    CS_DBLCLKS | CS_PARENTDC, /* style  */
     StaticWndProcA,      /* procA */
     StaticWndProcW,      /* procW */
     STATIC_EXTRA_BYTES,  /* extra */

windows/dialog.c

@@ -97,7 +97,7 @@ typedef struct
 const struct builtin_class_descr DIALOG_builtin_class =
 {
     DIALOG_CLASS_ATOMA,  /* name */
-    CS_GLOBALCLASS | CS_SAVEBITS | CS_DBLCLKS, /* style  */
+    CS_SAVEBITS | CS_DBLCLKS, /* style  */
     DefDlgProcA,        /* procA */
     DefDlgProcW,        /* procW */
     DLGWINDOWEXTRA,     /* extra */

windows/mdi.c

@@ -182,7 +182,7 @@ static void MDI_PostUpdate(HWND hwnd, MDICLIENTINFO* ci, WORD recalc)
 const struct builtin_class_descr MDICLIENT_builtin_class =
 {
     "MDIClient",            /* name */
-    CS_GLOBALCLASS,         /* style */
+    0,                      /* style */
     MDIClientWndProcA,      /* procA */
     MDIClientWndProcW,      /* procW */
     sizeof(MDICLIENTINFO),  /* extra */