Revert "gl-renderer: Make dummy surface current after all outputs are gone"

This reverts commit 36d699a164.

A different way to fix this same issue is the previous commit
"gl-renderer: do not unbind the context on output destroy"
which is needed for other reasons.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/renderer-gl/gl-renderer-internal.h

@@ -147,8 +147,6 @@ struct gl_renderer {
 
 	struct wl_signal destroy_signal;
 
-	struct wl_listener output_destroy_listener;
-
 	bool has_dmabuf_import_modifiers;
 	PFNEGLQUERYDMABUFFORMATSEXTPROC query_dmabuf_formats;
 	PFNEGLQUERYDMABUFMODIFIERSEXTPROC query_dmabuf_modifiers;

libweston/renderer-gl/gl-renderer.c

@@ -3514,8 +3514,6 @@ gl_renderer_destroy(struct weston_compositor *ec)
 	eglTerminate(gr->egl_display);
 	eglReleaseThread();
 
-	wl_list_remove(&gr->output_destroy_listener.link);
-
 	wl_array_release(&gr->vertices);
 	wl_array_release(&gr->vtxcnt);
 
@@ -3528,20 +3526,6 @@ gl_renderer_destroy(struct weston_compositor *ec)
 	free(gr);
 }
 
-static void
-output_handle_destroy(struct wl_listener *listener, void *data)
-{
-	struct gl_renderer *gr;
-	struct weston_output *output = data;
-
-	gr = container_of(listener, struct gl_renderer,
-			  output_destroy_listener);
-
-	if (wl_list_empty(&output->compositor->output_list))
-		eglMakeCurrent(gr->egl_display, gr->dummy_surface,
-			       gr->dummy_surface, gr->egl_context);
-}
-
 static int
 gl_renderer_create_pbuffer_surface(struct gl_renderer *gr) {
 	EGLConfig pbuffer_config;
@@ -3869,10 +3853,6 @@ gl_renderer_setup(struct weston_compositor *ec, EGLSurface egl_surface)
 						    fan_debug_repaint_binding,
 						    ec);
 
-	gr->output_destroy_listener.notify = output_handle_destroy;
-	wl_signal_add(&ec->output_destroyed_signal,
-		      &gr->output_destroy_listener);
-
 	weston_log("GL ES %d.%d - renderer features:\n",
 		   gr_gl_version_major(gr->gl_version),
 		   gr_gl_version_minor(gr->gl_version));