UI: top-bar reorganization

This hides the top-bar by default for everything
besides paint/sculpt workspaces.

- Use the top-bar mainly for active tool settings &
  popovers panel options.
  (transform / snap settings are an exception for this convention).
- Only show the top-bar (by default)
  in paint work-spaces (sculpt / texture-paint / grease-pencil).
- Add an active-tool panel to the sidebar.
- Split 3D view tabs into (Item / Tool / View).

D4721 with minor changes.

Further work is needed for the top-bar and image-editor.

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 456a012020f..9ee7bb3066d 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -303,6 +303,7 @@ static SpaceLink *view3d_new(const ScrArea *UNUSED(sa), const Scene *scene)
   BLI_addtail(&v3d->regionbase, ar);
   ar->regiontype = RGN_TYPE_TOOL_HEADER;
   ar->alignment = (U.uiflag & USER_HEADER_BOTTOM) ? RGN_ALIGN_BOTTOM : RGN_ALIGN_TOP;
+  ar->flag = RGN_FLAG_HIDDEN | RGN_FLAG_HIDDEN_BY_USER;
 
   /* header */
   ar = MEM_callocN(sizeof(ARegion), "header for view3d");