fix(mouse): drag vsep of window with 'statuscolumn' (#24462)

Problem:    Cannot drag a vertical separator to the right of a window
            whose 'statuscolumn' is wider than itself.
Solution:   Never treat a click on a vertical separator as a click on
            'statuscolumn'.

1 files changed, 5 insertions, 15 deletions

diff --git a/src/nvim/mouse.c b/src/nvim/mouse.c
index aca15eb0e2..d8341d2b10 100644
--- a/src/nvim/mouse.c
+++ b/src/nvim/mouse.c
@@ -1107,21 +1107,11 @@ retnomove:
   }
 
   bool below_window = grid == DEFAULT_GRID_HANDLE && row + wp->w_winbar_height >= wp->w_height;
-  on_status_line = (below_window)
-    ? row + wp->w_winbar_height - wp->w_height + 1 == 1
-    : false;
-
-  on_winbar = (row == -1)
-    ? wp->w_winbar_height != 0
-    : false;
-
-  on_statuscol = !below_window && !on_status_line && !on_winbar && col < win_col_off(wp)
-    ? *wp->w_p_stc != NUL
-    : false;
-
-  on_sep_line = grid == DEFAULT_GRID_HANDLE && col >= wp->w_width
-    ? col - wp->w_width + 1 == 1
-    : false;
+  on_status_line = below_window && row + wp->w_winbar_height - wp->w_height + 1 == 1;
+  on_sep_line = grid == DEFAULT_GRID_HANDLE && col >= wp->w_width && col - wp->w_width + 1 == 1;
+  on_winbar = row == -1 && wp->w_winbar_height != 0;
+  on_statuscol = !below_window && !on_status_line && !on_sep_line && !on_winbar
+                 && *wp->w_p_stc != NUL && col < win_col_off(wp);
 
   // The rightmost character of the status line might be a vertical
   // separator character if there is no connecting window to the right.