Prevent assert failure in knife.
It seems sometimes a knife edge with the same vertex on both ends was created sometimes.
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@@ -497,7 +497,7 @@ static KnifeVert *knife_split_edge(KnifeTool_OpData *kcd, KnifeEdge *kfe, float
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* and move cur data to prev. */
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static void knife_add_single_cut(KnifeTool_OpData *kcd)
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{
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KnifeEdge *kfe = new_knife_edge(kcd), *kfe2 = NULL, *kfe3 = NULL;
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KnifeEdge *kfe, *kfe2 = NULL, *kfe3 = NULL;
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if ((kcd->prev.vert && kcd->prev.vert == kcd->curr.vert) ||
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(kcd->prev.edge && kcd->prev.edge == kcd->curr.edge))
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@@ -506,6 +506,7 @@ static void knife_add_single_cut(KnifeTool_OpData *kcd)
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return;
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}
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kfe = new_knife_edge(kcd);
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kfe->draw = true;
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if (kcd->prev.vert) {
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@@ -2738,7 +2739,7 @@ static void knife_make_chain_cut(KnifeTool_OpData *kcd, BMFace *f, ListBase *cha
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l_new = NULL;
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if (nco == 0) {
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/* Want to prevent creating two-sided polygons */
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if (BM_edge_exists(v1, v2)) {
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if (v1 == v2 || BM_edge_exists(v1, v2)) {
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f_new = NULL;
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}
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else {
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