core: fix refresh of bar item "scroll" in root bar after /buffer clear (closes #590)

CHANGELOG.md

@@ -25,6 +25,7 @@
 - irc: clear /list buffer when disconnecting from server ([#2133](https://github.com/weechat/weechat/issues/2133))
 - irc: display an explicit message on /list buffer when the list of channels is empty ([#2133](https://github.com/weechat/weechat/issues/2133))
 - xfer: fix send of data on the DCC chat buffer after `/upgrade` if the buffer was opened before the upgrade ([#2092](https://github.com/weechat/weechat/issues/2092))
+- core: fix refresh of bar item "scroll" in root bar after `/buffer clear` ([#590](https://github.com/weechat/weechat/issues/590))
 - php: fix return value of function hdata_longlong
 - tcl: fix return value of function hdata_longlong ([#2119](https://github.com/weechat/weechat/issues/2119))
 - relay: fix websocket permessage-deflate extension when the client doesn't send the max window bits parameters ([#1549](https://github.com/weechat/weechat/issues/1549))

src/gui/gui-line.c

@@ -1288,6 +1288,7 @@ gui_line_remove_from_list (struct t_gui_buffer *buffer,
                     ptr_scroll->lines_after = 0;
                     gui_window_ask_refresh (1);
                 }
+                ptr_win->scroll_changed = 1;
             }
 
             if (ptr_scroll->text_search_start_line == line)
@@ -1441,10 +1442,28 @@ gui_line_free (struct t_gui_buffer *buffer, struct t_gui_line *line)
 void
 gui_line_free_all (struct t_gui_buffer *buffer)
 {
+    struct t_gui_window *ptr_win;
+
+    for (ptr_win = gui_windows; ptr_win; ptr_win = ptr_win->next_window)
+    {
+        ptr_win->scroll_changed = 0;
+    }
+
     while (buffer->own_lines->first_line)
     {
         gui_line_free (buffer, buffer->own_lines->first_line);
     }
+
+    for (ptr_win = gui_windows; ptr_win; ptr_win = ptr_win->next_window)
+    {
+        if (ptr_win->scroll_changed)
+        {
+            ptr_win->scroll_changed = 0;
+            (void) hook_signal_send ("window_scrolled",
+                                     WEECHAT_HOOK_SIGNAL_POINTER,
+                                     ptr_win);
+        }
+    }
 }
 
 /*

src/gui/gui-window.c

@@ -716,6 +716,7 @@ gui_window_new (struct t_gui_window *parent_window, struct t_gui_buffer *buffer,
 
     /* scroll */
     gui_window_scroll_init (new_window->scroll, buffer);
+    new_window->scroll_changed = 0;
 
     /* coordinates */
     new_window->coords_size = 0;
@@ -1964,6 +1965,7 @@ gui_window_hdata_window_cb (const void *pointer, void *data,
         HDATA_VAR(struct t_gui_window, layout_plugin_name, STRING, 0, NULL, NULL);
         HDATA_VAR(struct t_gui_window, layout_buffer_name, STRING, 0, NULL, NULL);
         HDATA_VAR(struct t_gui_window, scroll, POINTER, 0, NULL, "window_scroll");
+        HDATA_VAR(struct t_gui_window, scroll_changed, INTEGER, 0, NULL, NULL);
         HDATA_VAR(struct t_gui_window, ptr_tree, POINTER, 0, NULL, "window_tree");
         HDATA_VAR(struct t_gui_window, prev_window, POINTER, 0, NULL, hdata_name);
         HDATA_VAR(struct t_gui_window, next_window, POINTER, 0, NULL, hdata_name);
@@ -2134,6 +2136,7 @@ gui_window_print_log ()
         log_printf ("  layout_plugin_name. : '%s'", ptr_window->layout_plugin_name);
         log_printf ("  layout_buffer_name. : '%s'", ptr_window->layout_buffer_name);
         log_printf ("  scroll. . . . . . . : %p", ptr_window->scroll);
+        log_printf ("  scroll_changed. . . : %d", ptr_window->scroll_changed);
         log_printf ("  coords_size . . . . : %d", ptr_window->coords_size);
         log_printf ("  coords. . . . . . . : %p", ptr_window->coords);
         log_printf ("  ptr_tree. . . . . . : %p", ptr_window->ptr_tree);

src/gui/gui-window.h

@@ -72,6 +72,7 @@ struct t_gui_window
     /* scroll */
     struct t_gui_window_scroll *scroll; /* scroll infos for each buffer     */
                                         /* scrolled in this window          */
+    int scroll_changed;                 /* scrolled changed?                */
 
     /* coordinates (for focus) */
     int coords_size;                   /* size of coords (number of lines)  */