Fix T66668: frame selected bone not working in weight paint mode

'viewselected_exec()' [which uses evaluated view layer] would query
BASE_SELECTED flag, but it was not set on base_eval, but on its
base_orig.

reason for this is 'ed_object_select_pick()' would modify base flags
[through 'ED_object_base_select()'], but not tag scene
ID_RECALC_BASE_FLAGS.

thx @sergey for hinting.

Reviewers: sergey, brecht

Maniphest Tasks: T66668

Differential Revision: https://developer.blender.org/D5235

source/blender/editors/space_view3d/view3d_select.c

@@ -2319,6 +2319,7 @@ static bool ed_object_select_pick(bContext *C,
           retval = true;
           WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, basact->object);
           WM_event_add_notifier(C, NC_OBJECT | ND_BONE_ACTIVE, basact->object);
+          DEG_id_tag_update(&scene->id, ID_RECALC_BASE_FLAGS);
 
           /* in weightpaint, we use selected bone to select vertexgroup,
            * so no switch to new active object */