core: flush stdout/stderr after sending text directly on them (fix corrupted data sent to hook_process() callback) (closes #442)

src/gui/curses/gui-curses-key.c

@@ -465,7 +465,10 @@ gui_key_flush (int paste)
                      * found
                      */
                     if (CONFIG_BOOLEAN(config_look_search_text_not_found_alert))
-                        printf ("\a");
+                    {
+                        fprintf (stderr, "\a");
+                        fflush (stderr);
+                    }
                 }
                 else
                 {

src/gui/curses/gui-curses-mouse.c

@@ -89,6 +89,7 @@ gui_mouse_enable ()
 {
     gui_mouse_enabled = 1;
     fprintf (stderr, "\033[?1005h\033[?1000h\033[?1002h");
+    fflush (stderr);
 
     (void) hook_signal_send ("mouse_enabled",
                              WEECHAT_HOOK_SIGNAL_STRING, NULL);
@@ -103,6 +104,7 @@ gui_mouse_disable ()
 {
     gui_mouse_enabled = 0;
     fprintf (stderr, "\033[?1002l\033[?1000l\033[?1005l");
+    fflush (stderr);
 
     (void) hook_signal_send ("mouse_disabled",
                              WEECHAT_HOOK_SIGNAL_STRING, NULL);

src/gui/curses/gui-curses-window.c

@@ -2521,6 +2521,7 @@ gui_window_send_clipboard (const char *storage_unit, const char *text)
         fprintf (stderr, "\033]52;%s;%s\a",
                  (storage_unit) ? storage_unit : "",
                  text_base64);
+        fflush (stderr);
         free (text_base64);
     }
 }
@@ -2545,6 +2546,7 @@ gui_window_set_bracketed_paste_mode (int enable)
              (screen) ? "\033P" : "",
              (enable) ? "h" : "l",
              (screen) ? "\033\\" : "");
+    fflush (stderr);
 }
 
 /*