syncobj: drop current buffer when done

FIFO presentation modes requires us to drop current buffer when done
with it so we send our release points and client will send us new
acquire/release points. if waiting for next commit it will never arrive.

src/protocols/core/Compositor.cpp

@@ -467,6 +467,15 @@ void CWLSurfaceResource::commitPendingState() {
             nullptr);
     }
 
+    // #TODO
+    // fifo mode requires us to drop the current buffer before next commit
+    // otherwise release points arent being sent and we dont recieve new acquire
+    // and release points.
+    if (current.buffer->buffer->isSynchronous() && syncobj) {
+        dropCurrentBuffer();
+        return;
+    }
+
     // for async buffers, we can only release the buffer once we are unrefing it from current.
     // if the backend took it, ref it with the lambda. Otherwise, the end of this scope will release it.
     if (previousBuffer && previousBuffer->buffer && !previousBuffer->buffer->isSynchronous()) {