Improve Fl_Screen_Driver::traverse_to_gl_subwindows() so it can be called for a window that is not current.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12923 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Fl_Screen_Driver.cxx b/src/Fl_Screen_Driver.cxx
index 6006dcaf8..bbc354bb1 100644
--- a/src/Fl_Screen_Driver.cxx
+++ b/src/Fl_Screen_Driver.cxx
@@ -192,7 +192,7 @@ Fl_RGB_Image *Fl_Screen_Driver::traverse_to_gl_subwindows(Fl_Group *g, int x, in
     full_img = pi->rectangle_capture(g, x, y, w, h);
   }
   else if ( g->as_window() ) {
-    if (full_img) g->as_window()->make_current();
+    if (Fl_Window::current() != g) g->as_window()->make_current();
     full_img = Fl::screen_driver()->read_win_rectangle(x, y, w, h);
   }
   float full_img_scale =  (full_img && w > 0 ? float(full_img->data_w())/w : 1);