[gnumeric] Borders: check if "none" border is leaked too.

[Morten Welinder <mortenw src gnome org>]

commit 50f2039501898a7c297c2511502a7f6bc70144c8
Author: Morten Welinder <terra gnome org>
Date:   Tue May 8 10:30:01 2018 -0400

    Borders: check if "none" border is leaked too.

 src/style-border.c |   31 ++++++++++++++++++++++++++-----
 1 files changed, 26 insertions(+), 5 deletions(-)
---
diff --git a/src/style-border.c b/src/style-border.c
index 0250164..e071a8a 100644
--- a/src/style-border.c
+++ b/src/style-border.c
@@ -136,6 +136,11 @@ style_border_hash (gconstpointer v)
        return (GPOINTER_TO_UINT(b->color) ^ b->line_type);
 }
 
+/**
+ * gnm_style_border_none:
+ *
+ * Returns: (transfer none): A #GnmBorder with no borders.
+ */
 GnmBorder *
 gnm_style_border_none (void)
 {
@@ -155,7 +160,7 @@ gnm_style_border_none (void)
 
 /**
  * gnm_style_border_none_set_color:
- * @color:
+ * @color: (transfer full): #GnmColor
  *
  * This function updates the color of gnm_style_border_none when the wanted grid
  * color is known. gnm_style_border_none tells how to render the grid. Because
@@ -165,7 +170,6 @@ gnm_style_border_none (void)
  * color is default (which is black), the grid color is gray, as returned by
  * style_color_grid ().  - otherwise, the auto pattern color is used for the
  * grid.
- * NOTE : Absorbs a reference to @color.
  */
 void
 gnm_style_border_none_set_color (GnmColor *color)
@@ -186,7 +190,7 @@ gnm_style_border_none_set_color (GnmColor *color)
 /**
  * gnm_style_border_fetch:
  * @line_type: dash style
- * @color: (transfer full): colour
+ * @color: (transfer full) (nullable): colour
  * @orientation: Not currently used.
  *
  * Fetches a GnmBorder from the cache, creating one if necessary.  Absorbs
@@ -280,6 +284,12 @@ gnm_style_border_get_orientation (GnmStyleBorderLocation type)
        }
 }
 
+/**
+ * gnm_style_border_ref:
+ * @border: (nullable): #GnmBorder
+ *
+ * Returns: (transfer full): a reference to @border
+ */
 GnmBorder *
 gnm_style_border_ref (GnmBorder *border)
 {
@@ -291,6 +301,10 @@ gnm_style_border_ref (GnmBorder *border)
        return border;
 }
 
+/**
+ * gnm_style_border_unref:
+ * @border: (transfer full) (nullable): #GnmBorder
+ */
 void
 gnm_style_border_unref (GnmBorder *border)
 {
@@ -334,12 +348,19 @@ cb_border_leak (gpointer key, gpointer value, gpointer user_data)
                    border->ref_count);
 }
 
+/**
+ * gnm_border_shutdown: (skip)
+ */
 void
 gnm_border_shutdown (void)
 {
        if (border_none) {
-               style_color_unref (border_none->color);
-               g_free (border_none);
+               if (border_none->ref_count == 1) {
+                       style_color_unref (border_none->color);
+                       g_free (border_none);
+               } else {
+                       cb_border_leak (NULL, border_none, NULL);
+               }
                border_none = NULL;
        }