Git: Prevent tracking tags

Change-Id: Iea935aa226b70de936653b7637b4b9bb5e9c64cf
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/branchmodel.cpp

@@ -77,6 +77,18 @@ public:
         return children.isEmpty();
     }
 
+    bool isTag() const
+    {
+        if (!parent)
+            return false;
+        for (const BranchNode *p = this; p->parent; p = p->parent) {
+            // find root child with name "tags"
+            if (!p->parent->parent && p->name == QLatin1String("tags"))
+                return true;
+        }
+        return false;
+    }
+
     bool childOf(BranchNode *node) const
     {
         if (this == node)
@@ -435,6 +447,13 @@ bool BranchModel::isLeaf(const QModelIndex &idx) const
     return node->isLeaf();
 }
 
+bool BranchModel::isTag(const QModelIndex &idx) const
+{
+    if (!idx.isValid())
+        return false;
+    return indexToNode(idx)->isTag();
+}
+
 void BranchModel::removeBranch(const QModelIndex &idx)
 {
     QString branch = branchName(idx);