[meld] tree: Allow path state setting to take custom display text

[Kai Willadsen <kaiw src gnome org>]

commit 1478bed1ab7cd9dda99c354822be8694a6cdfd7c
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Dec 16 10:39:59 2017 +1000

    tree: Allow path state setting to take custom display text
    
    This is for use anywhere that the plain path basename isn't enough,
    although really it's only currently going to be used for showing symlink
    targets.

 meld/tree.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/meld/tree.py b/meld/tree.py
index 1784db90..4d0d67ed 100644
--- a/meld/tree.py
+++ b/meld/tree.py
@@ -133,10 +133,11 @@ class DiffTreeStore(SearchableTreeStore):
                            str(STATE_ERROR))
         self.set_state(it, pane, STATE_ERROR, msg)
 
-    def set_path_state(self, it, pane, state, isdir=0):
-        fullname = self.get_value(it, self.column_index(COL_PATH, pane))
-        name = GLib.markup_escape_text(os.path.basename(fullname))
-        self.set_state(it, pane, state, name, isdir)
+    def set_path_state(self, it, pane, state, isdir=0, display_text=None):
+        if not display_text:
+            fullname = self.get_value(it, self.column_index(COL_PATH, pane))
+            display_text = GLib.markup_escape_text(os.path.basename(fullname))
+        self.set_state(it, pane, state, display_text, isdir)
 
     def set_state(self, it, pane, state, label, isdir=0):
         col_idx = self.column_index