core: improve and fix bugs on standard paste and bracketed paste

Changes:
- wait control sequence for end of bracketed paste (and only after, check if
  we should ask confirmation to user)
- add option weechat.look.paste_bracketed_timer_delay to force the end of
  bracketed paste if the control sequence for end of bracketed paste was not
  received in time
- in bracketed paste mode, with paste_max_lines=1, do not ask confirmation for
  one line (ask for one line only if paste_max_lines=0)
- fix bugs with mintty: bracketed paste should be ok every time (even if some
  codes are sometimes partially received, WeeChat will now handle that properly);
  the standard paste often fails (due to bug in mintty, which sends paste very
  slowly to remote app); so the bracketed paste mode is highly recommended with
  mintty
- after paste in bracketed paste mode, the undo key (ctrl+"_" by default) will
  undo whole paste, not chars one by one

src/core/wee-command.c

@@ -2394,7 +2394,9 @@ COMMAND_CALLBACK(input)
         else if (string_strcasecmp (argv[1], "redo") == 0)
             gui_input_redo (buffer);
         else if (string_strcasecmp (argv[1], "paste_start") == 0)
-            gui_key_paste_bracketed_start ();
+        {
+            /* do nothing here */
+        }
         else if (string_strcasecmp (argv[1], "paste_stop") == 0)
         {
             /* do nothing here */

src/core/wee-config.c

@@ -126,6 +126,7 @@ struct t_config_option *config_look_mouse_timer_delay;
 struct t_config_option *config_look_nickmode;
 struct t_config_option *config_look_nickmode_empty;
 struct t_config_option *config_look_paste_bracketed;
+struct t_config_option *config_look_paste_bracketed_timer_delay;
 struct t_config_option *config_look_paste_max_lines;
 struct t_config_option *config_look_prefix[GUI_CHAT_NUM_PREFIXES];
 struct t_config_option *config_look_prefix_align;
@@ -1981,12 +1982,19 @@ config_weechat_init_options ()
            "text from typed-in text (\"ESC[200~\", followed by the pasted text, "
            "followed by \"ESC[201~\")"),
         NULL, 0, 0, "off", NULL, 0, NULL, NULL, &config_change_paste_bracketed, NULL, NULL, NULL);
+    config_look_paste_bracketed_timer_delay = config_file_new_option (
+        weechat_config_file, ptr_section,
+        "paste_bracketed_timer_delay", "integer",
+        N_("force end of bracketed paste after this delay (in seconds) if the "
+           "control sequence for end of bracketed paste (\"ESC[201~\") was not "
+           "received in time"),
+        NULL, 1, 60, "10", NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL);
     config_look_paste_max_lines = config_file_new_option (
         weechat_config_file, ptr_section,
         "paste_max_lines", "integer",
         N_("max number of lines for paste without asking user "
            "(-1 = disable this feature)"),
-        NULL, -1, INT_MAX, "3", NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL);
+        NULL, -1, INT_MAX, "1", NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL);
     config_look_prefix[GUI_CHAT_PREFIX_ERROR] = config_file_new_option (
         weechat_config_file, ptr_section,
         "prefix_error", "string",

src/core/wee-config.h

@@ -150,6 +150,7 @@ extern struct t_config_option *config_look_mouse_timer_delay;
 extern struct t_config_option *config_look_nickmode;
 extern struct t_config_option *config_look_nickmode_empty;
 extern struct t_config_option *config_look_paste_bracketed;
+extern struct t_config_option *config_look_paste_bracketed_timer_delay;
 extern struct t_config_option *config_look_paste_max_lines;
 extern struct t_config_option *config_look_prefix[];
 extern struct t_config_option *config_look_prefix_align;