Fix T40839: Object Font Text Rendering Bug

The issue was caused by the wrong objects order for
convertblender.c. Dependency graph totally missed
handling of this situation.

Fixed now, but it's not that pretty, don't try this
at home obviously. But consider this to be good enough
for the current dependency graph.

Details are in the build_dag_object().

source/blender/blenkernel/intern/depsgraph.c

@@ -59,6 +59,7 @@
 #include "DNA_movieclip_types.h"
 #include "DNA_mask_types.h"
 
+#include "BKE_anim.h"
 #include "BKE_animsys.h"
 #include "BKE_action.h"
 #include "BKE_effect.h"
@@ -688,6 +689,29 @@ static void build_dag_object(DagForest *dag, DagNode *scenenode, Scene *scene, O
 				dag_add_relation(dag, node2, node, DAG_RL_DATA_DATA | DAG_RL_OB_DATA, "Curve Taper");
 			}
 			if (ob->type == OB_FONT) {
+				/* Really rather dirty hack. needs to support font family to work
+				 * reliably on render export.
+				 *
+				 * This totally mimics behavior of regular verts duplication with
+				 * parenting. The only tricky thing here is to get list of objects
+				 * used for the custom "font".
+				 *
+				 * This shouldn't harm so much because this code only runs on DAG
+				 * rebuild and this feature is not that commonly used.
+				 *
+				 *                                                 - sergey -
+				 */
+				if (cu->family[0] != '\n') {
+					ListBase *duplilist;
+					DupliObject *dob;
+					duplilist = object_duplilist(G.main->eval_ctx, scene, ob);
+					for (dob= duplilist->first; dob; dob = dob->next) {
+						node2 = dag_get_node(dag, dob->ob);
+						dag_add_relation(dag, node, node2, DAG_RL_DATA_DATA | DAG_RL_OB_DATA, "Object Font");
+					}
+					free_object_duplilist(duplilist);
+				}
+
 				if (cu->textoncurve) {
 					node2 = dag_get_node(dag, cu->textoncurve);
 					/* Text on curve requires path to be evaluated for the target curve. */