Bug:
evaluate_table_formula located "(" with find (forward) and ")" with
rfind (backward), then sliced body[open+1..close]. For malformed input
like =)( the delimiters come out reversed and the slice panics ("slice
index starts at 2 but ends at 0") during tessellation - on the render
path, from a single pasted cell value.
Reproduce:
1. Insert a table and double-click a cell.
2. Type =)( (or =a)b(c ) and press Enter.
3. Before: the next repaint panics.
4. After: the formula does not evaluate; the literal text renders.
Fix:
body.get(open + 1..close)? - reversed delimiters yield None and the
caller's existing fallback shows the literal text. Well-formed formulas
are untouched: regression tests keep =SUM(A1:B2), =AVERAGE(A1:B2) and
=A1 evaluating, and reject =)(, =a)b(c and =).
Karim Jerbi
d175861fa4