Merge branch 'blender-v2.93-release'

Conflicts:
	source/blender/editors/object/object_add.c

source/blender/editors/gpencil/gpencil_edit.c

@@ -4544,6 +4544,9 @@ static int gpencil_stroke_separate_exec(bContext *C, wmOperator *op)
 
   eGP_SeparateModes mode = RNA_enum_get(op->ptr, "mode");
 
+  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd_src);
+  const bool is_curve_edit = (bool)GPENCIL_CURVE_EDIT_SESSIONS_ON(gpd_src);
+
   /* sanity checks */
   if (ELEM(NULL, gpd_src)) {
     return OPERATOR_CANCELLED;
@@ -4554,8 +4557,22 @@ static int gpencil_stroke_separate_exec(bContext *C, wmOperator *op)
     return OPERATOR_CANCELLED;
   }
 
-  const bool is_multiedit = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gpd_src);
-  const bool is_curve_edit = (bool)GPENCIL_CURVE_EDIT_SESSIONS_ON(gpd_src);
+  /* Cancel if nothing selected. */
+  if (ELEM(mode, GP_SEPARATE_POINT, GP_SEPARATE_STROKE)) {
+    bool has_selected = false;
+    CTX_DATA_BEGIN (C, bGPDlayer *, gpl, editable_gpencil_layers) {
+      if (ED_gpencil_layer_has_selected_stroke(gpl, is_multiedit)) {
+        has_selected = true;
+        break;
+      }
+    }
+    CTX_DATA_END;
+
+    if (!has_selected) {
+      BKE_report(op->reports, RPT_ERROR, "Nothing selected");
+      return OPERATOR_CANCELLED;
+    }
+  }
 
   /* Create a new object. */
   /* Take into account user preferences for duplicating actions. */

source/blender/editors/gpencil/gpencil_utils.c

@@ -542,6 +542,38 @@ bool gpencil_stroke_inside_circle(const float mval[2], int rad, int x0, int y0,
   return false;
 }
 
+/* ******************************************************** */
+/* Selection Validity Testing */
+
+bool ED_gpencil_frame_has_selected_stroke(const bGPDframe *gpf)
+{
+  LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
+    if (gps->flag & GP_STROKE_SELECT) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool ED_gpencil_layer_has_selected_stroke(const bGPDlayer *gpl, const bool is_multiedit)
+{
+  bGPDframe *init_gpf = (is_multiedit) ? gpl->frames.first : gpl->actframe;
+  for (bGPDframe *gpf = init_gpf; gpf; gpf = gpf->next) {
+    if ((gpf == gpl->actframe) || ((gpf->flag & GP_FRAME_SELECT) && (is_multiedit))) {
+      if (ED_gpencil_frame_has_selected_stroke(gpf)) {
+        return true;
+      }
+    }
+    /* If not multiedit, exit loop. */
+    if (!is_multiedit) {
+      break;
+    }
+  }
+
+  return false;
+}
+
 /* ******************************************************** */
 /* Stroke Validity Testing */
 

source/blender/editors/include/ED_gpencil.h

@@ -144,6 +144,8 @@ bool ED_gpencil_data_owner_is_annotation(struct PointerRNA *owner_ptr);
 bool ED_gpencil_has_keyframe_v3d(struct Scene *scene, struct Object *ob, int cfra);
 
 /* ----------- Stroke Editing Utilities ---------------- */
+bool ED_gpencil_frame_has_selected_stroke(const struct bGPDframe *gpf);
+bool ED_gpencil_layer_has_selected_stroke(const struct bGPDlayer *gpl, const bool is_multiedit);
 
 bool ED_gpencil_stroke_can_use_direct(const struct ScrArea *area, const struct bGPDstroke *gps);
 bool ED_gpencil_stroke_can_use(const struct bContext *C, const struct bGPDstroke *gps);