Move custom transform orientations to workspace

This commit moves the list of transform orientations from scenes to workspaces.
Main reasons for this are:
* Transform orientations are UI data and should not be stored in the scene.
* Introducion of workspaces caused some (expected) glitches with transform orientations. Mainly when removing one.
* Improves code.

More technically speaking, this commit does:
* Move list of custom transform orientations from Scene to WorkSpace struct.
* Store active transform orientation index separate from View3D.twmode (twmode can only be set to preprocessor defined values now).
* Display custom transform orientation name in header when transforming in it (used to show "global" which isn't really correct).

1 files changed, 6 insertions, 2 deletions

diff --git a/source/blender/editors/transform/transform_manipulator.c b/source/blender/editors/transform/transform_manipulator.c
index 009cb2bac63..df529b0054d 100644
--- a/source/blender/editors/transform/transform_manipulator.c
+++ b/source/blender/editors/transform/transform_manipulator.c
@@ -60,6 +60,7 @@
 #include "BKE_editmesh.h"
 #include "BKE_lattice.h"
 #include "BKE_gpencil.h"
+#include "BKE_workspace.h"
 
 #include "BIF_gl.h"
 
@@ -986,10 +987,13 @@ static int calc_manipulator_stats(const bContext *C)
 				copy_m4_m3(rv3d->twmat, mat);
 				break;
 			}
-			default: /* V3D_MANIP_CUSTOM */
+			case V3D_MANIP_CUSTOM:
 			{
+				TransformOrientation *custom_orientation = BKE_workspace_transform_orientation_find(
+				                                               CTX_wm_workspace(C), v3d->custom_orientation_index);
 				float mat[3][3];
-				if (applyTransformOrientation(C, mat, NULL, v3d->twmode - V3D_MANIP_CUSTOM)) {
+
+				if (applyTransformOrientation(custom_orientation, mat, NULL)) {
 					copy_m4_m3(rv3d->twmat, mat);
 				}
 				break;