Small fix for depsgraph debug graphviz: empty labels for edges require an explicit id.
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@ -619,8 +619,8 @@ static void deg_debug_graphviz_node_relations(const DebugContext &ctx,
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deg_debug_fprintf(ctx, "label=\"%s\"", rel->name);
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deg_debug_fprintf(ctx, ",fontname=\"%s\"", deg_debug_graphviz_fontname);
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#else
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/* Note: some dummy label seems to be necessary or dot gets confused for some reason ... */
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deg_debug_fprintf(ctx, "label=\" \"");
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/* Note: without label an id seem necessary to avoid bugs in graphviz/dot */
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deg_debug_fprintf(ctx, "id=\"%s\"", rel->name);
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#endif
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deg_debug_fprintf(ctx, ",color="); deg_debug_graphviz_relation_color(ctx, rel);
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deg_debug_fprintf(ctx, ",penwidth=\"%f\"", penwidth);
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