The API functions `command` and `command_options` (when `split_newline` = 0,
which is the default value) don't split on newline and then the first line is
executed and the subsequent lines (after "\n") are ignored.
There are no changes when the input has multiple lines filled by the user: the
split is done and multiple commands are executed (for example if the user is
pasting multiple commands to execute).
This allows the input callback function for a buffer to receive multiple
lines at once, instead of the message being split on newline before
being sent to the callback. It adds a new flag, input_multiline, to
control this. This flag defaults to 0 which is the current behavior.
The default value is 0 (legacy behavior).
When it is set to 1, an empty input (just by pressing Return with nothing in
input) is sent to the input callback, which receives an empty string.
This pointer is the first argument received by callbacks, and the
existing argument "data" is now automatically freed by WeeChat when the
object containing the callback is removed.
With this new pointer, the linked list of callbacks in scripts has been
removed. This will improve speed of scripts (using a lot of hooks),
reduce memory used by scripts and reduce time to unload scripts.
Following functions are affected in the C API:
* exec_on_files
* config_new
* config_new_section
* config_new_option
* hook_command
* hook_command_run
* hook_timer
* hook_fd
* hook_process
* hook_process_hashtable
* hook_connect
* hook_print
* hook_signal
* hook_hsignal
* hook_config
* hook_completion
* hook_modifier
* hook_info
* hook_info_hashtable
* hook_infolist
* hook_hdata
* hook_focus
* unhook_all_plugin
* buffer_new
* bar_item_new
* upgrade_new
* upgrade_read
New (core) command /version displays version, and number of upgrades done with
first start date (if # /upgrade > 0).
The number of upgrades is displayed at startup (if > 0).
Sébastien Helleu