Fix T99037: bpy.ops.transform.rotate fails in background mode

This reverts commit c503c5f756aab850e8afe2513b2dc7b645cf84af,
alternate fix for T82244.

Scripts that run in background mode expected rotation to be usable,
defaulting to the 3D viewport when there is no active windowing data.

Also resolves T88610.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform_mode_rotate.c b/source/blender/editors/transform/transform_mode_rotate.c
index 94caaa288e5..f75c65448df 100644
--- a/source/blender/editors/transform/transform_mode_rotate.c
+++ b/source/blender/editors/transform/transform_mode_rotate.c
@@ -11,6 +11,7 @@
 #include "BLI_task.h"
 
 #include "BKE_context.h"
+#include "BKE_report.h"
 #include "BKE_unit.h"
 
 #include "ED_screen.h"
@@ -343,6 +344,11 @@ static void applyRotationMatrix(TransInfo *t, float mat_xform[4][4])
 
 void initRotation(TransInfo *t)
 {
+  if (t->spacetype == SPACE_ACTION) {
+    BKE_report(t->reports, RPT_ERROR, "Rotation is not supported in the Dope Sheet Editor");
+    t->state = TRANS_CANCEL;
+  }
+
   t->mode = TFM_ROTATION;
   t->transform = applyRotation;
   t->transform_matrix = applyRotationMatrix;