2.5-rc and changes.

CHANGES

@@ -1,3 +1,81 @@
+CHANGES FROM 2.4 to 2.5 09 May 2017
+
+* Fix send-keys and send-prefix in copy-mode (so C-b C-b works). GitHub issue
+  905.
+
+* Set the current pane for rotate-window so it works in command sequences.
+
+* Add pane_mode format.
+
+* Differentiate M-Up from Escape+Up when possible (that is, in terminals with
+  xterm(1) style functions keys). GitHub issue 907.
+
+* Add session_stack and window_stack_index formats.
+
+* Some new control mode notifications and corresponding hooks:
+  pane-mode-changed, window-pane-changed, client-session-changed,
+  session-window-changed.
+
+* Format pane_search_string for last search term while in copy mode (useful
+  with command-prompt -I).
+
+* Fix a problem with high CPU usage and multiple clients with #(). GitHub issue
+  889.
+
+* Fix UTF-8 combining characters in column 0.
+
+* Fix reference counting so that panes are properly destroyed and their
+  processes killed.
+
+* Clamp SU (CSI S) parameter to work around a bug in Konsole.
+
+* Tweak line wrapping in full width panes to play more nicely with terminal
+  copy and paste.
+
+* Fix when we emit SGR 0 in capture-pane -e.
+
+* Do not change TERM until after config file parsing has finished, so that
+  commands run inside the config file can use it to make decisions (typically
+  about default-terminal).
+
+* Make the initial client wait until config file parsing has finished to avoid
+  racing with commands.
+
+* Fix core when if-shell fails.
+
+* Only use ED to clear screen if the pane is at the bottom.
+
+* Fix multibyte UTF-8 output.
+
+* Code improvements around target (-t) resolution.
+
+* Change how the default target (for commands without -t) is managed across
+  command sequences: now it is set up at the start and commands are required
+  to update it if needed. Fixes binding command sequences to mouse keys.
+
+* Make if-shell from the config file work correctly.
+
+* Change to always check the root key table if no binding is found in the
+  current table (prefix table or copy-mode table or whatever). This means that
+  root key bindings will take effect even in copy mode, if not overridden by a
+  copy mode key binding.
+
+* Fix so that the history file works again.
+
+* Run config file without a client rather than using the first client, restores
+  previous behaviour.
+
+* If a #() command doesn't exit, continue to read from it and use its last full
+  line of output.
+
+* Handle slow terminals and fast output better: when the amount of data
+  outstanding gets too large, discard output until it is drained and we are
+  able to do a full redraw. Prevents tmux sitting on a huge buffer that the
+  terminal will take forever to consume.
+
+* Do not redraw a client unless we realistically think it can accept the data -
+  defer redraws until the client has nothing else waiting to write.
+ 
 CHANGES FROM 2.3 to 2.4 20 April 2017
 
 Incompatible Changes