[meld] filediff, meldbuffer: Clarify some existing comments

[Kai Willadsen <kaiw src gnome org>]

commit d26d56bba5dde04665c258d378330b9962f2649b
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Thu Dec 21 06:11:12 2017 +1000

    filediff, meldbuffer: Clarify some existing comments

 meld/filediff.py   | 4 +++-
 meld/meldbuffer.py | 7 ++++---
 2 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index b5328227..4b372e32 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -767,7 +767,9 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
             if not self.linediffer.syncpoints:
                 self.linediffer.change_sequence(pane, startline, sizechange,
                                                 self.buffer_filtered)
-            # FIXME: diff-changed signal for the current buffer would be cleaner
+            # TODO: We should have a diff-changed signal for the
+            # current buffer instead of passing everything through
+            # cursor change logic.
             focused_pane = self._get_focused_pane()
             if focused_pane != -1:
                 self.on_cursor_position_changed(self.textbuffer[focused_pane],
diff --git a/meld/meldbuffer.py b/meld/meldbuffer.py
index 71e2c12c..aaff77fb 100644
--- a/meld/meldbuffer.py
+++ b/meld/meldbuffer.py
@@ -192,9 +192,10 @@ class MeldBufferData(GObject.GObject):
         self._sourcefile.bind_property(
             'encoding', self, 'encoding', GObject.BindingFlags.DEFAULT)
 
-        # This is aiming to maintain existing behaviour for filename. The
-        # behaviour is however wrong and should be fixed.
-        # FIXME: maintaining previous comment above; this is now wrong in different awful ways
+        # TODO: Figure out how we use filename, and decide on how this
+        # should actually work. This was previously wrong, but since
+        # then we've moved to Python 3 with a different filename
+        # encoding model, and also changed stuff to use Gio.File.
         self.filename = value.get_path() if value else None
         self.update_mtime()
         self.connect_monitor()