WM: only return PASS_THROUGH on PRESS for selection operators

Some selection operators return (PASS_THROUGH & FINISHED) so the tweak
event isn't suppressed from the PRESS event having been handled.

This is now restricted to events with a PRESS action.
Without this, using CLICK for selection was passing the event through
which could run other actions unintentionally.

source/blender/editors/space_view3d/view3d_select.c

@@ -2813,7 +2813,9 @@ static int view3d_select_invoke(bContext *C, wmOperator *op, const wmEvent *even
 {
   RNA_int_set_array(op->ptr, "location", event->mval);
 
-  return view3d_select_exec(C, op);
+  const int retval = view3d_select_exec(C, op);
+
+  return WM_operator_flag_only_pass_through_on_press(retval, event);
 }
 
 void VIEW3D_OT_select(wmOperatorType *ot)

source/blender/editors/uvedit/uvedit_select.c

@@ -2122,7 +2122,9 @@ static int uv_select_invoke(bContext *C, wmOperator *op, const wmEvent *event)
   UI_view2d_region_to_view(&region->v2d, event->mval[0], event->mval[1], &co[0], &co[1]);
   RNA_float_set_array(op->ptr, "location", co);
 
-  return uv_select_exec(C, op);
+  const int retval = uv_select_exec(C, op);
+
+  return WM_operator_flag_only_pass_through_on_press(retval, event);
 }
 
 void UV_OT_select(wmOperatorType *ot)
@@ -2281,7 +2283,9 @@ static int uv_select_loop_invoke(bContext *C, wmOperator *op, const wmEvent *eve
   UI_view2d_region_to_view(&region->v2d, event->mval[0], event->mval[1], &co[0], &co[1]);
   RNA_float_set_array(op->ptr, "location", co);
 
-  return uv_select_loop_exec(C, op);
+  const int retval = uv_select_loop_exec(C, op);
+
+  return WM_operator_flag_only_pass_through_on_press(retval, event);
 }
 
 void UV_OT_select_loop(wmOperatorType *ot)
@@ -2341,7 +2345,9 @@ static int uv_select_edge_ring_invoke(bContext *C, wmOperator *op, const wmEvent
   UI_view2d_region_to_view(&region->v2d, event->mval[0], event->mval[1], &co[0], &co[1]);
   RNA_float_set_array(op->ptr, "location", co);
 
-  return uv_select_edge_ring_exec(C, op);
+  const int retval = uv_select_edge_ring_exec(C, op);
+
+  return WM_operator_flag_only_pass_through_on_press(retval, event);
 }
 
 void UV_OT_select_edge_ring(wmOperatorType *ot)

source/blender/windowmanager/WM_api.h

@@ -707,6 +707,8 @@ void WM_event_fileselect_event(struct wmWindowManager *wm, void *ophandle, int e
 
 void WM_operator_region_active_win_set(struct bContext *C);
 
+int WM_operator_flag_only_pass_through_on_press(int retval, const struct wmEvent *event);
+
 /* drag and drop */
 struct wmDrag *WM_event_start_drag(
     struct bContext *C, int icon, int type, void *poin, double value, unsigned int flags);

source/blender/windowmanager/intern/wm_operator_utils.c

@@ -40,6 +40,24 @@
 #include "ED_object.h"
 #include "ED_screen.h"
 
+/* -------------------------------------------------------------------- */
+/** \name Generic Utilities
+ * \{ */
+
+/**
+ * Only finish + pass through for press events (allowing press-tweak).
+ */
+int WM_operator_flag_only_pass_through_on_press(int retval, const struct wmEvent *event)
+{
+  if ((event->val != KM_PRESS) &&
+      ((retval & OPERATOR_PASS_THROUGH) && (retval & OPERATOR_FINISHED))) {
+    retval &= ~OPERATOR_PASS_THROUGH;
+  }
+  return retval;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Value Interaction Helper
  *