fix 'dummy' formspec images (the hacky way)

init.lua

@@ -96,6 +96,7 @@ for _, onpole in ipairs({"", "_onpole"}) do
 		wield_image = "basic_signs_sign_wall_locked_inv.png",
 		groups = wood_groups,
 		default_color = "0",
+		on_rightclick = signs_lib.construct_sign,
 		on_construct = signs_lib.construct_sign,
 		on_destruct = signs_lib.destruct_sign,
 		after_place_node = function(pos, placer, itemstack, pointed_thing)
@@ -145,6 +146,7 @@ for _, onpole in ipairs({"", "_onpole"}) do
 			wield_image = "basic_signs_steel_"..color[1].."_inv.png",
 			groups = steel_groups,
 			default_color = color[3],
+			on_rightclick = signs_lib.construct_sign,
 			on_construct = signs_lib.construct_sign,
 			on_destruct = signs_lib.destruct_sign,
 			after_place_node = signs_lib.after_place_node,
@@ -196,6 +198,7 @@ minetest.register_node("basic_signs:yard_sign", {
 	wield_image = "default_sign_wood.png",
 	groups = nci_wood_groups,
 	default_color = "0",
+	on_rightclick = signs_lib.construct_sign,
 	on_construct = signs_lib.construct_sign,
 	on_destruct = signs_lib.destruct_sign,
 	after_place_node = signs_lib.after_place_node,
@@ -240,6 +243,7 @@ minetest.register_node("basic_signs:hanging_sign", {
 	wield_image = "default_sign_wood.png",
 	groups = nci_wood_groups,
 	default_color = "0",
+	on_rightclick = signs_lib.construct_sign,
 	on_construct = signs_lib.construct_sign,
 	on_destruct = signs_lib.destruct_sign,
 	after_place_node = signs_lib.after_place_node,

models/basic_signs_hanging_sign_entity.obj

@@ -1,15 +1,15 @@
-# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden hanging sign--entity.blend'
+# Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden hanging sign.blend'
 # www.blender.org
-o Cube
-v 0.406250 -0.281250 -0.039063
-v 0.406250 0.281250 -0.039062
-v -0.406250 -0.281250 -0.039063
-v -0.406250 0.281250 -0.039062
-vt 0.906250 0.781250
-vt 0.093750 0.781250
-vt 0.093750 0.218750
-vt 0.906250 0.218750
-vn 0.0000 0.0000 -1.0000
-g Cube_Cube_None
+o Plane
+v 0.406250 -0.281250 -0.039062
+v -0.406250 -0.281250 -0.039062
+v 0.406250 0.281250 -0.039063
+v -0.406250 0.281250 -0.039063
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vn 0.0000 -0.0000 -1.0000
+g Plane_Plane_None
 s off
-f 4/1/1 2/2/1 1/3/1 3/4/1
+f 1/1/1 2/2/1 4/3/1 3/4/1

models/basic_signs_yard_sign_entity.obj

@@ -1,15 +1,15 @@
 # Blender v2.79 (sub 0) OBJ File: 'basic_signs wooden yard sign.blend'
 # www.blender.org
-o Cube
-v 0.406250 -0.218750 -0.070313
-v 0.406250 0.343750 -0.070312
-v -0.406250 -0.218750 -0.070313
-v -0.406250 0.343750 -0.070312
-vt 0.906250 0.781250
-vt 0.093750 0.781250
-vt 0.093750 0.218750
-vt 0.906250 0.218750
-vn 0.0000 0.0000 -1.0000
-g Cube_Cube_None
+o Plane
+v 0.406250 -0.218750 -0.070312
+v -0.406250 -0.218750 -0.070312
+v 0.406250 0.343750 -0.070313
+v -0.406250 0.343750 -0.070313
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vn 0.0000 -0.0000 -1.0000
+g Plane_Plane_None
 s off
-f 4/1/1 2/2/1 1/3/1 3/4/1
+f 1/1/1 2/2/1 4/3/1 3/4/1