[gnumeric] diff: fix dispatch of sheet start/end.

[Morten Welinder <mortenw src gnome org>]

commit 9c0a2515d6613e1600e3f8daa904099eb0137471
Author: Morten Welinder <terra gnome org>
Date:   Mon Apr 9 14:23:36 2018 -0400

    diff: fix dispatch of sheet start/end.

 src/sheet-diff.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/src/sheet-diff.c b/src/sheet-diff.c
index bcb5bdb..c603920 100644
--- a/src/sheet-diff.c
+++ b/src/sheet-diff.c
@@ -366,6 +366,8 @@ real_diff_sheets (GnmDiffIState *istate, Sheet *old_sheet, Sheet *new_sheet)
        istate->old_sheet = old_sheet;
        istate->new_sheet = new_sheet;
 
+       DISPATCH(sheet_start) (istate->user, old_sheet, new_sheet);
+
        range_init_full_sheet (&or, old_sheet);
        range_init_full_sheet (&nr, new_sheet);
        range_intersection (&istate->common_range, &or, &nr);
@@ -377,6 +379,8 @@ real_diff_sheets (GnmDiffIState *istate, Sheet *old_sheet, Sheet *new_sheet)
        diff_sheets_cells (istate);
        diff_sheets_styles (istate);
 
+       DISPATCH(sheet_end) (istate->user);
+
        istate->old_sheet = istate->new_sheet = NULL;
 }
 
@@ -422,18 +426,18 @@ real_diff_workbooks (GnmDiffIState *istate,
                Sheet *old_sheet = workbook_sheet_by_index (old_wb, i);
                Sheet *new_sheet = workbook_sheet_by_name (new_wb,
                                                           old_sheet->name_unquoted);
-               DISPATCH(sheet_start) (istate->user, old_sheet, new_sheet);
-
                if (new_sheet) {
                        if (new_sheet->index_in_wb < last_index)
                                sheet_order_changed = TRUE;
                        last_index = new_sheet->index_in_wb;
 
                        real_diff_sheets (istate, old_sheet, new_sheet);
-               } else
+               } else {
                        istate->diff_found = TRUE;
+                       DISPATCH(sheet_start) (istate->user, old_sheet, new_sheet);
+                       DISPATCH(sheet_end) (istate->user);
+               }
 
-               DISPATCH(sheet_end) (istate->user);
        }
 
        count = workbook_sheet_count (new_wb);