ui: Keep a GC pointer in draw_object

The `obj` pointer in `user_interface::draw_object` was not a GC pointer, but there is a `do...while` loop calling `obj->graph` that may cause a garbage collection, causing the input `obj` to be bogus. Fixes: #1115 Signed-off-by: Christophe de Dinechin <[email protected]>
c3d · Aug 17, 2024 · 28ff180 · 28ff180
1 parent 4524175
commit 28ff180
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/user_interface.cc b/src/user_interface.cc
@@ -2612,7 +2612,7 @@ bool user_interface::draw_stack()
 }
 
 
-bool user_interface::draw_object(object_p obj, uint top, uint bottom)
+bool user_interface::draw_object(object_p objp, uint top, uint bottom)
 // ----------------------------------------------------------------------------
 //   Draw the current equation or other topical object if necessary
 // ----------------------------------------------------------------------------
@@ -2623,6 +2623,7 @@ bool user_interface::draw_object(object_p obj, uint top, uint bottom)
               true);
     g.reduce_font();
     grob_g graph = nullptr;
+    object_g obj = objp;
     do
     {
         graph = obj->graph(g);