Fix some display bugs with read marker line, history, max prefix length, and chat refresh (bug #23153)

Some info about bugs fixed:
- when marker line (dotted) was on top of window (and not visible), this caused
  bug on last lines of buffer (not refreshed)
- marker line is not set for a buffer after a switch, only if buffer it not
  displayed in other window
- when we delete lines in a buffer (if lines > weechat.history.max_lines), we
  force a full refresh of chat if remaining lines is < to chat height
  and we compute again max prefix length for buffer (before max prefix length
  was always incremented, never decremented)

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gui/curses/gui-curses-window.c b/src/gui/curses/gui-curses-window.c
index bc0a3f7ca..a72a5f4e0 100644
--- a/src/gui/curses/gui-curses-window.c
+++ b/src/gui/curses/gui-curses-window.c
@@ -633,7 +633,8 @@ gui_window_switch_to_buffer (struct t_gui_window *window,
     {
         window->start_line = NULL;
         window->start_line_pos = 0;
-        window->buffer->last_read_line = window->buffer->last_line;
+        if (window->buffer->num_displayed == 0)
+            window->buffer->last_read_line = window->buffer->last_line;
         if (buffer->last_read_line == buffer->last_line)
             buffer->last_read_line = NULL;
         gui_previous_buffer = window->buffer;