Fix offered links in tree/blob_actions partial

app/views/tree/_blob_actions.html.haml

 .btn-group.tree-btn-group
+  -# only show edit link for text files
+  - if @tree.text?
+    = link_to "edit", edit_project_tree_path(@project, @id), class: "btn very_small"
   = link_to "raw", project_blob_path(@project, @id), class: "btn very_small", target: "_blank"
-  = link_to "history", project_commits_path(@project, @id), class: "btn very_small"
+  -# only show normal/blame view links for text files
+  - if @tree.text?
+    - if current_page? project_blame_path(@project, @id)
+      = link_to "normal view", project_tree_path(@project, @id), class: "btn very_small"
+    - else
       = link_to "blame", project_blame_path(@project, @id), class: "btn very_small"
-  = link_to "edit", edit_project_tree_path(@project, @id), class: "btn very_small"
+  = link_to "history", project_commits_path(@project, @id), class: "btn very_small"