termio/exec: initial subprocess screen size should be sub padding

src/terminal/kitty/graphics_exec.zig

@@ -222,14 +222,14 @@ fn display(
 
             // We can do better by doing this with pure internal screen state
             // but this handles scroll regions.
-            const height = rect.bottom_right.y - rect.top_left.y + 1;
+            const height = rect.bottom_right.y - rect.top_left.y;
             for (0..height) |_| terminal.index() catch |err| {
                 log.warn("failed to move cursor: {}", .{err});
                 break;
             };
 
             terminal.setCursorPos(
-                terminal.screen.cursor.y + 1,
+                terminal.screen.cursor.y,
                 rect.bottom_right.x + 1,
             );
         },