T90371: Asset: Drop Material Tooltip.

This patch changes the drop named material tooltip to give feedback to
the user what is going to happen when they invoke the change.

There are 3 states:
* "": Operator will be canceled as not all data is present (dropping on
  background.)
* "Drop <named material> on <object name> (slot <slot number>, replacing
  <current material in slot>).
* "Drop <named material> on <object name> (slot <slot number).

Reviewed By: Severin

Maniphest Tasks: T90371

Differential Revision: https://developer.blender.org/D12106

1 files changed, 2 insertions, 5 deletions

diff --git a/source/blender/windowmanager/intern/wm_dragdrop.c b/source/blender/windowmanager/intern/wm_dragdrop.c
index c58d3c53e03..dcbb502117e 100644
--- a/source/blender/windowmanager/intern/wm_dragdrop.c
+++ b/source/blender/windowmanager/intern/wm_dragdrop.c
@@ -220,14 +220,11 @@ void WM_drag_free_list(struct ListBase *lb)
   }
 }
 
-static char *dropbox_tooltip(bContext *C,
-                             wmDrag *drag,
-                             const wmEvent *event,
-                             const wmDropBox *drop)
+static char *dropbox_tooltip(bContext *C, wmDrag *drag, const wmEvent *event, wmDropBox *drop)
 {
   char *tooltip = NULL;
   if (drop->tooltip) {
-    tooltip = drop->tooltip(C, drag, event);
+    tooltip = drop->tooltip(C, drag, event, drop);
   }
   if (!tooltip) {
     tooltip = BLI_strdup(WM_operatortype_name(drop->ot, drop->ptr));