[gitg] Disable commit context items if there is no real selection

[Jesse van den Kieboom <jessevdk src gnome org>]

commit f15433ff1a43e19f5535cca40e25f785615657c0
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Mon Aug 15 08:22:24 2016 +0200

    Disable commit context items if there is no real selection
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769897

 gitg/commit/gitg-commit.vala |   26 ++++++++++++++++++++------
 1 files changed, 20 insertions(+), 6 deletions(-)
---
diff --git a/gitg/commit/gitg-commit.vala b/gitg/commit/gitg-commit.vala
index 640a724..5412adf 100644
--- a/gitg/commit/gitg-commit.vala
+++ b/gitg/commit/gitg-commit.vala
@@ -1633,11 +1633,14 @@ namespace GitgCommit
                        Sidebar.Item.Type type;
 
                        var sitems = items_for_items(items, out type);
+                       var hasitems = sitems.length > 0;
 
                        if (type == Sidebar.Item.Type.UNSTAGED ||
                            type == Sidebar.Item.Type.UNTRACKED)
                        {
                                var stage = new Gtk.MenuItem.with_mnemonic(_("_Stage changes"));
+                               stage.sensitive = hasitems;
+
                                menu.append(stage);
 
                                stage.activate.connect(() => {
@@ -1648,6 +1651,8 @@ namespace GitgCommit
                        if (type == Sidebar.Item.Type.STAGED)
                        {
                                var stage = new Gtk.MenuItem.with_mnemonic(_("_Unstage changes"));
+                               stage.sensitive = hasitems;
+
                                menu.append(stage);
 
                                stage.activate.connect(() => {
@@ -1658,6 +1663,8 @@ namespace GitgCommit
                        if (type == Sidebar.Item.Type.UNSTAGED)
                        {
                                var discard = new Gtk.MenuItem.with_mnemonic(_("_Discard changes"));
+                               discard.sensitive = hasitems;
+
                                menu.append(discard);
 
                                discard.activate.connect(() => {
@@ -1668,6 +1675,8 @@ namespace GitgCommit
                        if (type == Sidebar.Item.Type.UNTRACKED)
                        {
                                var del = new Gtk.MenuItem.with_mnemonic(dngettext(null, "D_elete file", 
"D_elete files", sitems.length));
+                               del.sensitive = hasitems;
+
                                menu.append(del);
 
                                del.activate.connect(() => {
@@ -1675,16 +1684,21 @@ namespace GitgCommit
                                });
                        }
 
-                       var canedit = true;
+                       bool canedit = false;
 
-                       foreach (var item in sitems)
+                       if (hasitems)
                        {
-                               var file = item as Gitg.StageStatusFile;
+                               canedit = true;
 
-                               if (file == null || (file.flags & Ggit.StatusFlags.WORKING_TREE_DELETED) != 0)
+                               foreach (var item in sitems)
                                {
-                                       canedit = false;
-                                       break;
+                                       var file = item as Gitg.StageStatusFile;
+
+                                       if (file == null || (file.flags & 
Ggit.StatusFlags.WORKING_TREE_DELETED) != 0)
+                                       {
+                                               canedit = false;
+                                               break;
+                                       }
                                }
                        }