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Diffstat (limited to 'src/Fl_Gl_Window.cxx')
| -rw-r--r-- | src/Fl_Gl_Window.cxx | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Fl_Gl_Window.cxx b/src/Fl_Gl_Window.cxx index f5b41a2a0..9c29a7b38 100644 --- a/src/Fl_Gl_Window.cxx +++ b/src/Fl_Gl_Window.cxx @@ -292,6 +292,7 @@ int fl_overlay_depth = 0; void Fl_Gl_Window::flush() { + if (!shown()) return; uchar save_valid = valid_f_ & 1; #if HAVE_GL_OVERLAY && defined(WIN32) uchar save_valid_f = valid_f_; |