GPencil: Fix unreported missing Sculpt/Vertex/Weight paint brushes

This error was introduced wit the change in commit https://developer.blender.org/rB6a850f3cc840

As the brushes were not created, all modes except Edit were broken. 

Now, the brushes and palette are not created when load the file in versioning code, but when the mode is enabled.

Also, if the brush already exist, the parameters are not reset as it was done in the versioning code in order to keep user settings.

The same logic is used for the default palette.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/gpencil.c b/source/blender/blenkernel/intern/gpencil.c
index 041ef0503b9..04d3c32f599 100644
--- a/source/blender/blenkernel/intern/gpencil.c
+++ b/source/blender/blenkernel/intern/gpencil.c
@@ -1748,7 +1748,18 @@ void BKE_gpencil_palette_ensure(Main *bmain, Scene *scene)
   GpPaint *gp_paint = ts->gp_paint;
   Paint *paint = &gp_paint->paint;
 
+  if (paint->palette != NULL) {
+    return;
+  }
+
   paint->palette = BLI_findstring(&bmain->palettes, "Palette", offsetof(ID, name) + 2);
+  /* Try with first palette. */
+  if (bmain->palettes.first != NULL) {
+    paint->palette = bmain->palettes.first;
+    ts->gp_vertexpaint->paint.palette = paint->palette;
+    return;
+  }
+
   if (paint->palette == NULL) {
     paint->palette = BKE_palette_add(bmain, "Palette");
     ts->gp_vertexpaint->paint.palette = paint->palette;