Merge pull request #152 from nihilist-narwhal/fix-whole-sheet-selection

Whole-sheet selection: Fill and Remove Duplicates no longer run out of memory or time

crates/engine/src/cmd/data.rs

@@ -112,7 +112,8 @@ fn data_range(s: &Session, p: &Json) -> Result<RangeRef> {
     }
     let sel = d.selection.current();
     if !sel.is_single() {
-        let used = sh.used_range().unwrap_or(sel);
+        // An empty sheet has no data to work on: just the active cell.
+        let Some(used) = sh.used_range() else { return Ok(RangeRef::cell(d.selection.active)) };
         return Ok(sel.intersection(&used).unwrap_or(sel));
     }
     Ok(current_region(sh, d.selection.active))
@@ -668,6 +669,9 @@ fn remove_duplicates(s: &mut Session, p: &Json) -> Result<Json> {
     let r = data_range(s, p)?;
     let d = s.doc()?;
     let sh = d.wb.active().ok_or(EngineError::NoDocument)?;
+    // Rows and columns past the data are blank: only the part with data is compared (whole
+    // columns compared a million blank rows and reported them as removed duplicates).
+    let r = sh.used_range().and_then(|u| r.intersection(&u)).unwrap_or(RangeRef::cell(r.start));
     let header = bool_param(p, "header").unwrap_or_else(|| guess_header(&d.wb, sh, r));
     let cols: Vec<u32> = p
         .get("columns")