[gimp] app: use gimp_display_shell_get_line_status() for GimpToolLine.

[Jehan Pagès <jehanp src gnome org>]

commit e1621c32d32cb33a76a6f8e434d3b6e8a1b9aa59
Author: Jehan <jehan girinstud io>
Date:   Fri Dec 22 22:29:14 2017 +0100

    app: use gimp_display_shell_get_line_status() for GimpToolLine.
    
    Currently Blend tool only shows the vector coordinates whose usefulness
    is a bit of a question. Now it will also show distance (in current shell
    unit) and angle!

 app/display/gimptoolline.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/app/display/gimptoolline.c b/app/display/gimptoolline.c
index 21f1096..3561644 100644
--- a/app/display/gimptoolline.c
+++ b/app/display/gimptoolline.c
@@ -1560,12 +1560,24 @@ gimp_tool_line_update_status (GimpToolLine    *line,
         }
       else
         {
+          GimpDisplayShell *shell;
+          gchar            *enhanced_title;
+
+          shell = gimp_tool_widget_get_shell (GIMP_TOOL_WIDGET (line));
+          enhanced_title = gimp_display_shell_get_line_status (shell,
+                                                               private->status_title,
+                                                               ". ",
+                                                               private->x1,
+                                                               private->y1,
+                                                               private->x2,
+                                                               private->y2);
           gimp_tool_widget_set_status_coords (GIMP_TOOL_WIDGET (line),
-                                              private->status_title,
+                                              enhanced_title,
                                               private->x2 - private->x1,
                                               ", ",
                                               private->y2 - private->y1,
                                               status);
+          g_free (enhanced_title);
         }
 
       g_free (status);