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, 1 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_sculpt_paint.c b/source/blender/makesrna/intern/rna_sculpt_paint.c
index 00d42fc408b..f372180dd3b 100644
--- a/source/blender/makesrna/intern/rna_sculpt_paint.c
+++ b/source/blender/makesrna/intern/rna_sculpt_paint.c
@@ -481,7 +481,7 @@ static void rna_ImaPaint_canvas_update(bContext *C, PointerRNA *UNUSED(ptr))
 	bScreen *sc;
 	Image *ima = scene->toolsettings->imapaint.canvas;
 
-	for (sc = bmain->screen.first; sc; sc = sc->id.next) {
+	for (sc = bmain->screens.first; sc; sc = sc->id.next) {
 		ScrArea *sa;
 		for (sa = sc->areabase.first; sa; sa = sa->next) {
 			SpaceLink *slink;