LayerSurface: don't configure in response to unmap

We should wait until the next "initial commit" before
sending a configure after a layer surface unmaps itself.

 river/LayerShellOutput.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/river/LayerShellOutput.zig b/river/LayerShellOutput.zig
index 595602c..63b68f2 100644
--- a/river/LayerShellOutput.zig
+++ b/river/LayerShellOutput.zig
@@ -124,7 +124,9 @@ fn sendConfigures(
             assert(node.type == .tree);
             const node_data: *SceneNodeData = @ptrCast(@alignCast(node.data orelse continue));
             const layer_surface = node_data.data.layer_surface;
-            if (!layer_surface.wlr_layer_surface.initialized) {
+            if (!layer_surface.wlr_layer_surface.surface.mapped and
+                !layer_surface.wlr_layer_surface.initial_commit)
+            {
                 continue;
             }
             if (layer_surface.wlr_layer_surface.output != output.wlr_output) {