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#7 It's better gdk_gl_context_finalize() destroys gl_context.
We may cause memory leak if we only call
g_object_unref(gl_context) because
gdk_gl_context_finalize() doesn't call
_gdk_gl_context_destroy(). We can avoid the memory leak
by calling gdk_gl_context_destroy() instead of
g_object_unref() but this workaround has some problems.
* This isn't GLib-ish.
* We can't always call gdk_gl_context_destroy() for
doing unref gl_context. Someone may need gl_context.
gdk_gl-context_finalize() destroys gl_context.