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-rw-r--r--test/functional/ui/screen.lua1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/functional/ui/screen.lua b/test/functional/ui/screen.lua
index 6ee9e7b393..028fa2825d 100644
--- a/test/functional/ui/screen.lua
+++ b/test/functional/ui/screen.lua
@@ -769,6 +769,7 @@ end
function Screen:_handle_grid_cursor_goto(grid, row, col)
self._cursor.grid = grid
+ assert(row >= 0 and col >= 0)
self._cursor.row = row + 1
self._cursor.col = col + 1
end