[gnumeric] update modification time only when we in fact modified the file.

[Andreas J. Guelzow <guelzow src gnome org>]

commit 191eabafb591dd30610a5410f2b40dc4f064b2de
Author: Andreas J. Guelzow <aguelzow math concordia ab ca>
Date:   Wed Dec 9 13:38:19 2009 -0700

    update modification time only when we in fact modified the file.
    
    2009-12-09  Andreas J. Guelzow <aguelzow pyrshep ca>
    
    	* src/workbook-view.c (wbv_save_to_output): update modification time
    	  only when we in fact modified the file.

 ChangeLog           |   13 +++++++++----
 src/workbook-view.c |    6 ++++--
 2 files changed, 13 insertions(+), 6 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 084a4cc..b0dec14 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,14 @@
 2009-12-09  Andreas J. Guelzow <aguelzow pyrshep ca>
+	
+	* src/workbook-view.c (wbv_save_to_output): update modification time
+	  only when we in fact modified the file.
+	
+2009-12-09  Andreas J. Guelzow <aguelzow pyrshep ca>
 
-	* gutils.c (gnm_insert_meta_date): new
-	* gutils.h (gnm_insert_meta_date): new
-	* workbook-view.c (wbv_save_to_output): update modification time
-	* workbook.c (workbook_new): update creation date
+	* src/gutils.c (gnm_insert_meta_date): new
+	* src/gutils.h (gnm_insert_meta_date): new
+	* src/workbook-view.c (wbv_save_to_output): update modification time
+	* src/workbook.c (workbook_new): update creation date
 
 2009-12-06  Jean Brefort  <jean brefort normalesup org>
 
diff --git a/src/workbook-view.c b/src/workbook-view.c
index 826fc0f..8b62300 100644
--- a/src/workbook-view.c
+++ b/src/workbook-view.c
@@ -966,9 +966,11 @@ wbv_save_to_output (WorkbookView *wbv, GOFileSaver const *fs,
 {
 	GError const *err;
 	char const   *msg;
+	GODoc *godoc = wb_view_get_doc (wbv);
 
-	/* FIXME: we should be using the true modification time */
-	gnm_insert_meta_date (GO_DOC (wbv->wb), GSF_META_NAME_DATE_MODIFIED);
+	if (go_doc_is_dirty (godoc))
+	  /* FIXME: we should be using the true modification time */
+	  gnm_insert_meta_date (godoc, GSF_META_NAME_DATE_MODIFIED);
 	go_file_saver_save (fs, io_context, wbv, output);
 
 	/* The plugin convention is unclear */