Cleanup: use plural names for Main lists

Convention was not to but after discussion on 918941483f7e we agree its
best to change the convention.

Names now mostly follow RNA.

Some exceptions:

- Use 'nodetrees' instead of 'nodegroups'
  since the struct is called NodeTree.
- Use 'gpencils' instead of 'grease_pencil'
  since 'gpencil' is a common abbreviation in the C code.

Other exceptions:

- Leave 'wm' as it's a list of one.
- Leave 'ipo' as is for versioning.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/space_node/node_templates.c b/source/blender/editors/space_node/node_templates.c
index 206b32582e5..aef36b49814 100644
--- a/source/blender/editors/space_node/node_templates.c
+++ b/source/blender/editors/space_node/node_templates.c
@@ -301,7 +301,7 @@ static void ui_node_link_items(NodeLinkArg *arg, int in_out, NodeLinkItem **r_it
 		bNodeTree *ngroup;
 		int i;
 
-		for (ngroup = arg->bmain->nodetree.first; ngroup; ngroup = ngroup->id.next) {
+		for (ngroup = arg->bmain->nodetrees.first; ngroup; ngroup = ngroup->id.next) {
 			ListBase *lb = ((in_out == SOCK_IN) ? &ngroup->inputs : &ngroup->outputs);
 			totitems += BLI_listbase_count(lb);
 		}
@@ -310,7 +310,7 @@ static void ui_node_link_items(NodeLinkArg *arg, int in_out, NodeLinkItem **r_it
 			items = MEM_callocN(sizeof(NodeLinkItem) * totitems, "ui node link items");
 
 			i = 0;
-			for (ngroup = arg->bmain->nodetree.first; ngroup; ngroup = ngroup->id.next) {
+			for (ngroup = arg->bmain->nodetrees.first; ngroup; ngroup = ngroup->id.next) {
 				ListBase *lb = (in_out == SOCK_IN ? &ngroup->inputs : &ngroup->outputs);
 				bNodeSocket *stemp;
 				int index;