Comment on attachment 580971
Try creating a named cursor before a bitmap cursor

>+  { moz_none_bits,           moz_none_mask_bits,           0,  0,
NULL }

>         newType = MOZ_CURSOR_NONE;
>         break;

>+    // If by now we don't have a xcursor, this means we have to make a custom
>+    // one. First, we try creating a named cursor based on the hash of our
>+    // custom bitmap, as libXcursor has some magic to convert bitmapped 
>cursors
>+    // to themed cursors
>+    if (newType != 0xFF) {
>+        gdkcursor = gdk_cursor_new_from_name(gdk_display_get_default(),
>+                                             GtkCursors[newType].hash);

Doesn't this need to check that hash is non-null?

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https://bugs.launchpad.net/bugs/901838

Title:
  Ugly busy cursor in Thunderbird 9

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