cell_param returned None for any cell argument it could not parse, so every
command that falls back to the selection (cell.set, view.freezePanes,
formulas.trace*, insert.* and others) silently used the active cell instead:
set_cell with cell "ZZZZ0" wrote A1 and reported success. It also dropped a
sheet prefix, so "Other!B2" was applied to the active sheet.
cell_param now returns Result<Option<CellRef>>. An absent or null value is still
None, so the selection fallback is unchanged; an unparsable or non-string value
is an error; a sheet prefix naming a sheet other than the one the command works
on is an error.
cell_param_on is for the commands that resolve their own sheet (cell.get, links,
comments, notes, checkboxes, chart placement, paste): they accept a prefix naming
that sheet. cell.set resolves its own target sheet and still writes to another
existing sheet.
Local clippy (1.96) flags pre-existing code that an older toolchain accepted;
these lints fire on clean main and block `cargo xtask ci`. All rewrites are
behavior-preserving:
- core/date.rs, numfmt/render.rs, functions/math.rs, functions/stat.rs:
`!x.is_finite() || x < a || x >= b` -> `!(a..b).contains(&x)` (Range::contains
is false for NaN/inf, matching the existing is_finite guard).
- functions/util.rs: `!(A && !B)` -> `!A || B`.
- engine/cmd/file.rs: drop a dead `.filter(|| true)`.
- ui-egui/grid.rs: `find(|| true)` was always the first table (use `.first()`);
`wrap || Justify || (nl && wrap)` -> `wrap || Justify`.
- ui-egui/formula_bar.rs: `tab || (enter && false)` -> `tab`.
- engine/cmd/spelling.rs: split the wasm/non-wasm dictionary init so the
non-wasm `mut` no longer warns under wasm check.
MarekSpodBiedry