use saturating substraction to calculate Line ranges
@@ -177,7 +177,8 @@ impl<'b> Controller<'b> {
if let Some(line_changes) = line_changes {
for &line in line_changes.keys() {
let line = line as usize;
- line_ranges.push(LineRange::new(line - context, line + context));
+ line_ranges
+ .push(LineRange::new(line.saturating_sub(context), line + context));
}
}
