update TODO

TODO

@@ -1,26 +1,12 @@
-High Priority
--------------
-
-
-Medium Priority
----------------
-
-* tweak editing model, some behaviours are not intuitive, fix append when
-  end of line is selected (maybe we can merge some code between editor and
-  IncrementalInserter. By the way, IncrementalInserter is now only used by
-  InputHandler's InputMode::Insert, maybe this could be refactored).
-
 * encoding: support different encoding for files, make utf8 implementation
   more robust
 
+* support multi column chars
+
+* right-to-left, bidirectional text
+
 * key binding support
 
-* configurable insert mode completion support
-
-* Design an Asynchronous model for interaction with external tools.
-  For example Kakoune should provide a way to run a completion
-  shell command without freezing until the completer returns.
-
 * Mouse support
 
 * Crash recovery support (swap files)
@@ -28,8 +14,14 @@ Medium Priority
 * Sanitize prompt history handling, hooks should not have side effects
   on history
 
-* Rework jump list. one DynamicSelectionList per jump is too slow when
-  many selections are used (each buffer change makes all jumps update all
-  their selections)
-
 * automatic line splitting/paragraph formatting
+
+* Use boost::filesystem for path handling
+
+* folding support
+
+* spelling support
+
+* more than 16 colors support
+
+* investigate 'kakdiff'