[gtk/wip/chergert/glproto: 475/493] Revert "remove dead code"

[Christian Hergert <chergert src gnome org>]

commit 3e8935da0f9f4a606e80bfdbfb603ec8561a623e
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 16 17:24:54 2021 -0800

    Revert "remove dead code"
    
    This reverts commit b4750086e0953a62bc8a1be1ba03a0cc0aed81d5.

 gsk/next/gskglcommandqueue.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gsk/next/gskglcommandqueue.c b/gsk/next/gskglcommandqueue.c
index 4f09946243..921e87835f 100644
--- a/gsk/next/gskglcommandqueue.c
+++ b/gsk/next/gskglcommandqueue.c
@@ -435,6 +435,7 @@ gsk_gl_command_queue_begin_draw (GskGLCommandQueue     *self,
 void
 gsk_gl_command_queue_end_draw (GskGLCommandQueue *self)
 {
+  GskGLCommandBatch *last_batch;
   GskGLCommandBatch *batch;
 
   g_assert (GSK_IS_GL_COMMAND_QUEUE (self));
@@ -479,6 +480,11 @@ gsk_gl_command_queue_end_draw (GskGLCommandQueue *self)
       batch->draw.bind_count = 0;
     }
 
+  if (self->batches.len > 1)
+    last_batch = &self->batches.elements[self->batches.len - 2];
+  else
+    last_batch = NULL;
+
   enqueue_batch (self);
 
   self->in_draw = FALSE;