Row selectors ignore the value of the first header

[Jeff Parr]

Meta

Capybara Version: 3.40.0

Expected Behavior

have_table('Caption', with_rows: [{'this does not matter' => 'cell value'}] should only match when the header matches the key passed.

have_selector(:table_row, 'this does not matter' => 'Thomas') should only match when the header matches the key passed.

Actual Behavior

both selectors ignore the text of the header when it is in the first column

Steps to reproduce

I wrote some tests here: jparr@03e2f75

Both matchers do some previous sibling counting to verify the position of the header and cell which resolve to zero for the first column when there is a match and zero when there is no match.