Fix T87947: Trasnform: Keyboard input uses view orientation

When activated in modal, `translate`, `resize`, `rotate`, `shear` and
`edge_rotate_normal` use a different orientation than the set in scene.

This orientation needed to match since some of these modes can be switched
during operation.

The default orientation for these modes was `V3D_ORIENT_VIEW`.

And this changed when finishing the `translate` and `resize` to
`V3D_ORIENT_GLOBAL`.

But this could cause inconsistencies when inputting values from the
keyboard.

The solution now is to change the orientation when you change the mode.

---
Note: Although the user can expect the value entered to reflect the
orientation set in the scene, it would require a lot of changes and would
not be really useful.

source/blender/editors/transform/transform.c

@@ -1412,25 +1412,6 @@ void saveTransform(bContext *C, TransInfo *t, wmOperator *op)
   ToolSettings *ts = CTX_data_tool_settings(C);
   PropertyRNA *prop;
 
-  if (!(t->con.mode & CON_APPLY) && (t->flag & T_MODAL) &&
-      ELEM(t->mode, TFM_TRANSLATION, TFM_RESIZE)) {
-    /* When redoing these modes the first time, it's more convenient to save
-     * in the Global orientation. */
-    if (t->mode == TFM_TRANSLATION) {
-      mul_m3_v3(t->spacemtx, t->values_final);
-    }
-    else {
-      float tmat[3][3], sizemat[3][3];
-      size_to_mat3(sizemat, t->values_final);
-      mul_m3_m3m3(tmat, t->spacemtx, sizemat);
-      mat3_to_size(t->values_final, tmat);
-    }
-
-    BLI_assert(t->orient_curr == O_DEFAULT);
-    unit_m3(t->spacemtx);
-    t->orient[0].type = V3D_ORIENT_GLOBAL;
-  }
-
   /* Save back mode in case we're in the generic operator */
   if ((prop = RNA_struct_find_property(op->ptr, "mode"))) {
     RNA_property_enum_set(op->ptr, prop, t->mode);

source/blender/editors/transform/transform.h

@@ -598,6 +598,8 @@ typedef struct TransInfo {
    * mouse button then.) */
   bool is_launch_event_tweak;
 
+  bool is_orient_set;
+
   struct {
     short type;
     float matrix[3][3];

source/blender/editors/transform/transform_generics.c

@@ -414,8 +414,6 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
     int orient_type_set = -1;
     int orient_type_matrix_set = -1;
 
-    bool use_orient_axis = false;
-
     if ((t->spacetype == SPACE_VIEW3D) && (t->region->regiontype == RGN_TYPE_WINDOW)) {
       TransformOrientationSlot *orient_slot = &t->scene->orientation_slots[SCE_ORIENT_DEFAULT];
       orient_type_scene = orient_slot->type;
@@ -435,7 +433,6 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 
     if (op && (prop = RNA_struct_find_property(op->ptr, "orient_axis"))) {
       t->orient_axis = RNA_property_enum_get(op->ptr, prop);
-      use_orient_axis = true;
     }
 
     if (op && (prop = RNA_struct_find_property(op->ptr, "orient_axis_ortho"))) {
@@ -457,28 +454,23 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 
     if (orient_type_set != -1) {
       orient_type_default = orient_type_set;
+      t->is_orient_set = true;
     }
     else if (orient_type_matrix_set != -1) {
       orient_type_default = orient_type_set = orient_type_matrix_set;
+      t->is_orient_set = true;
     }
     else if (t->con.mode & CON_APPLY) {
       orient_type_default = orient_type_set = orient_type_scene;
     }
     else {
+      orient_type_default = orient_type_scene;
       if (orient_type_scene == V3D_ORIENT_GLOBAL) {
         orient_type_set = V3D_ORIENT_LOCAL;
       }
       else {
         orient_type_set = V3D_ORIENT_GLOBAL;
       }
-
-      if ((t->flag & T_MODAL) && (use_orient_axis || transform_mode_is_changeable(t->mode)) &&
-          (t->mode != TFM_ALIGN)) {
-        orient_type_default = V3D_ORIENT_VIEW;
-      }
-      else {
-        orient_type_default = orient_type_scene;
-      }
     }
 
     BLI_assert(!ELEM(-1, orient_type_default, orient_type_set));
@@ -487,9 +479,9 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
       orient_type_set = V3D_ORIENT_CUSTOM_MATRIX;
     }
 
-    orient_types[0] = (short)orient_type_default;
-    orient_types[1] = (short)orient_type_scene;
-    orient_types[2] = (short)orient_type_set;
+    orient_types[O_DEFAULT] = (short)orient_type_default;
+    orient_types[O_SCENE] = (short)orient_type_scene;
+    orient_types[O_SET] = (short)orient_type_set;
 
     for (int i = 0; i < 3; i++) {
       /* For efficiency, avoid calculating the same orientation twice. */
@@ -506,9 +498,6 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
       }
     }
 
-    /* Set orient_curr to -1 in order to force the update in
-     * `transform_orientations_current_set`. */
-    t->orient_curr = -1;
     transform_orientations_current_set(t, (t->con.mode & CON_APPLY) ? 2 : 0);
   }
 

source/blender/editors/transform/transform_mode.c

@@ -45,6 +45,7 @@
 
 #include "transform.h"
 #include "transform_convert.h"
+#include "transform_orientations.h"
 #include "transform_snap.h"
 
 /* Own include. */
@@ -1271,4 +1272,38 @@ void transform_mode_init(TransInfo *t, wmOperator *op, const int mode)
    * BLI_assert(t->mode == mode); */
 }
 
+/**
+ * When in modal nad not set, initializes a default orientation for the mode.
+ */
+void transform_mode_default_modal_orientation_set(TransInfo *t, int type)
+{
+  /* Currently only these types are supported. */
+  BLI_assert(ELEM(type, V3D_ORIENT_GLOBAL, V3D_ORIENT_VIEW));
+
+  if (t->is_orient_set) {
+    return;
+  }
+
+  if (!(t->flag & T_MODAL)) {
+    return;
+  }
+
+  if (t->orient[O_DEFAULT].type == type) {
+    return;
+  }
+
+  RegionView3D *rv3d = NULL;
+  if ((type == V3D_ORIENT_VIEW) && (t->spacetype == SPACE_VIEW3D) && t->region &&
+      (t->region->regiontype == RGN_TYPE_WINDOW)) {
+    rv3d = t->region->regiondata;
+  }
+
+  t->orient[O_DEFAULT].type = ED_transform_calc_orientation_from_type_ex(
+      NULL, t->orient[O_DEFAULT].matrix, NULL, rv3d, NULL, NULL, type, 0);
+
+  if (t->orient_curr == O_DEFAULT) {
+    /* Update Orientation. */
+    transform_orientations_current_set(t, O_DEFAULT);
+  }
+}
 /** \} */

source/blender/editors/transform/transform_mode.h

@@ -61,6 +61,7 @@ short getAnimEdit_SnapMode(TransInfo *t);
 void doAnimEdit_SnapFrame(
     TransInfo *t, TransData *td, TransData2D *td2d, struct AnimData *adt, short autosnap);
 void transform_mode_init(TransInfo *t, struct wmOperator *op, const int mode);
+void transform_mode_default_modal_orientation_set(TransInfo *t, int type);
 
 /* transform_mode_align.c */
 void initAlign(TransInfo *t);

source/blender/editors/transform/transform_mode_edge_rotate_normal.c

@@ -148,5 +148,7 @@ void initNormalRotation(TransInfo *t)
 
     storeCustomLNorValue(tc, bm);
   }
+
+  transform_mode_default_modal_orientation_set(t, V3D_ORIENT_VIEW);
 }
 /** \} */

source/blender/editors/transform/transform_mode_resize.c

@@ -194,5 +194,7 @@ void initResize(TransInfo *t)
   t->num.unit_type[0] = B_UNIT_NONE;
   t->num.unit_type[1] = B_UNIT_NONE;
   t->num.unit_type[2] = B_UNIT_NONE;
+
+  transform_mode_default_modal_orientation_set(t, V3D_ORIENT_GLOBAL);
 }
 /** \} */

source/blender/editors/transform/transform_mode_rotate.c

@@ -249,5 +249,7 @@ void initRotation(TransInfo *t)
   if (t->flag & T_2D_EDIT) {
     t->flag |= T_NO_CONSTRAINT;
   }
+
+  transform_mode_default_modal_orientation_set(t, V3D_ORIENT_VIEW);
 }
 /** \} */

source/blender/editors/transform/transform_mode_shear.c

@@ -232,5 +232,7 @@ void initShear(TransInfo *t)
   t->num.unit_type[0] = B_UNIT_NONE; /* Don't think we have any unit here? */
 
   t->flag |= T_NO_CONSTRAINT;
+
+  transform_mode_default_modal_orientation_set(t, V3D_ORIENT_VIEW);
 }
 /** \} */

source/blender/editors/transform/transform_mode_translate.c

@@ -470,5 +470,7 @@ void initTranslation(TransInfo *t)
     t->num.unit_type[1] = B_UNIT_NONE;
     t->num.unit_type[2] = B_UNIT_NONE;
   }
+
+  transform_mode_default_modal_orientation_set(t, V3D_ORIENT_GLOBAL);
 }
 /** \} */

source/blender/editors/transform/transform_orientations.c

@@ -671,10 +671,6 @@ const char *transform_orientations_spacename_get(TransInfo *t, const short orien
 
 void transform_orientations_current_set(TransInfo *t, const short orient_index)
 {
-  if (t->orient_curr == orient_index) {
-    return;
-  }
-
   const short orientation = t->orient[orient_index].type;
   const char *spacename = transform_orientations_spacename_get(t, orientation);