Increase clipping stack size (#1139)

FL/Fl_Graphics_Driver.H

@@ -2,7 +2,7 @@
 // Declaration of classes Fl_Graphics_Driver, Fl_Scalable_Graphics_Driver,
 // and Fl_Font_Descriptor for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 2010-2023 by Bill Spitzak and others.
+// Copyright 2010-2024 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -52,7 +52,12 @@ typedef void (*Fl_Draw_Image_Cb)(void* data,int x,int y,int w,uchar* buf);
 struct Fl_Fontdesc;
 typedef struct _PangoFontDescription PangoFontDescription;
 
-#define FL_REGION_STACK_SIZE 10
+// FIXME: The following constants are deprecated and will be removed in FLTK 1.5.0
+// in favor of dynamic clipping stack allocation. This needs C++11 features.
+// See issue #1139: "FL_REGION_STACK_SIZE could be increased"
+// and issue #1140: "Fix static array allocation".
+
+#define FL_REGION_STACK_SIZE 64
 #define FL_MATRIX_STACK_SIZE 32
 
 /**