screen: implement proper ageing on screen resize

Screen-resize doesn't actually move any cells so it's fairly easy to age
new cells. No need to redraw the whole buffer.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

diff --git a/src/tsm_screen.c b/src/tsm_screen.c
index 24ffb56..f8e2b69 100644 (file)
--- a/src/tsm_screen.c
+++ b/src/tsm_screen.c
@@ -734,8 +734,6 @@ int tsm_screen_resize(struct tsm_screen *con, unsigned int x,
        }
 
        inc_age(con);
-       /* TODO: more sophisticated ageing */
-       con->age = con->age_cnt;
 
        /* clear expansion/padding area */
        start = x;
@@ -779,22 +777,22 @@ int tsm_screen_resize(struct tsm_screen *con, unsigned int x,
 
        con->size_x = x;
        if (con->cursor_x >= con->size_x)
-               con->cursor_x = con->size_x - 1;
+               move_cursor(con, con->size_x - 1, con->cursor_y);
 
        /* scroll buffer if screen height shrinks */
        if (y < con->size_y) {
                diff = con->size_y - y;
                screen_scroll_up(con, diff);
                if (con->cursor_y > diff)
-                       con->cursor_y -= diff;
+                       move_cursor(con, con->cursor_x, con->cursor_y - diff);
                else
-                       con->cursor_y = 0;
+                       move_cursor(con, con->cursor_x, 0);
        }
 
        con->size_y = y;
        con->margin_bottom = con->size_y - 1;
        if (con->cursor_y >= con->size_y)
-               con->cursor_y = con->size_y - 1;
+               move_cursor(con, con->cursor_x, con->size_y - 1);
 
        return 0;
 }