Thibault Saunier authored Oct 25, 2023 and GStreamer Marge Bot committed Jan 13, 2024

Even in the case where we are not in passthrough but the subclasses are
going to run the allocation query, we need to ensure that we have a
GLContext ready to be used. Otherwise we might end up with assertions
with `gloverlaycompositor` like:

```
 #0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=140285688829504) at ./nptl/pthread_kill.c:44
 #1  __pthread_kill_internal (signo=6, threadid=140285688829504) at ./nptl/pthread_kill.c:78
 #2  __GI___pthread_kill (threadid=140285688829504, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
 #3  0x00007f985ed88476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
 #4  0x00007f985ed6e7f3 in __GI_abort () at ./stdlib/abort.c:79
 #5  0x00007f985faedb57 in g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f9856251b80 <__func__.5> "gst_gl_buffer_pool_set_config", message=<optimized out>) at ../../../glib/gtestutils.c:3253
 #6...