core: add mouse support (task #5435), free cursor movement, hook_focus, fix bugs with key "^" (bug #32072, bug #21381), fix bugs with bar windows, completion and /buffer

New features and bugs fixed:
- mouse support: new command /mouse, new option weechat.look.mouse, new key context "mouse"
- free movement of cursor: new command /cursor, new key context "cursor"
- new hook_focus (used by cursor and mouse)
- info "cursor_mode"
- bugs fixed with key "^"
- allow plugin name in /buffer name
- fix bugs with bar windows: do not create bar windows for hidden bars
- fix completion bug when two words for completion are equal but with different case
- automatic scroll direction in /bar scroll (x/y is now optional)

src/gui/gui-cursor.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 Sebastien Helleu <flashcode@flashtux.org>
+ *
+ * This file is part of WeeChat, the extensible chat client.
+ *
+ * WeeChat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * WeeChat is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with WeeChat.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __WEECHAT_GUI_CURSOR_H
+#define __WEECHAT_GUI_CURSOR_H 1
+
+/* cursor structures */
+
+struct t_gui_cursor_info
+{
+    int x, y;                          /* (x,y) on screen                   */
+    struct t_gui_window *window;       /* window found                      */
+    int chat;                          /* 1 for chat area, otherwise 0      */
+    struct t_gui_bar_window *bar_window; /* bar window found                */
+    char *bar_item;                    /* bar item found                    */
+    int item_line;                     /* line in bar item                  */
+    int item_col;                      /* column in bar item                */
+};
+
+/* cursor variables */
+
+extern int gui_cursor_mode;
+extern int gui_cursor_debug;
+extern int gui_cursor_x;
+extern int gui_cursor_y;
+
+/* cursor functions */
+
+extern void gui_cursor_mode_toggle ();
+extern void gui_cursor_debug_toggle ();
+extern void gui_cursor_get_info (int x, int y,
+                                 struct t_gui_cursor_info *cursor_info);
+extern void gui_cursor_move_xy (int x, int y);
+extern void gui_cursor_move_add_xy (int add_x, int add_y);
+extern void gui_cursor_move_area_add_xy (int add_x, int add_y);
+extern void gui_cursor_move_area (const char *area);
+
+#endif /* __WEECHAT_GUI_CURSOR_H */