refactor(grid): move out grid_* functions from screen.c

Also normalize some types. use "size_t" for unsigned array offsets.
Fix -Wconversion issues missed as screen.c is missing this check.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nvim/ui_compositor.c b/src/nvim/ui_compositor.c
index 60ad8609a4..f76158ff12 100644
--- a/src/nvim/ui_compositor.c
+++ b/src/nvim/ui_compositor.c
@@ -635,7 +635,7 @@ static void ui_comp_grid_scroll(UI *ui, Integer grid, Integer top, Integer bot,
       // ideally win_update() should keep track of this itself and not scroll
       // the invalid space.
       if (curgrid->attrs[curgrid->line_offset[r - curgrid->comp_row]
-                         + left - curgrid->comp_col] >= 0) {
+                         + (size_t)left - (size_t)curgrid->comp_col] >= 0) {
         compose_line(r, left, right, 0);
       }
     }