Restore reading backspace if typing with autoread disabled.

internal/reader/progress.go

@@ -41,10 +41,11 @@ func (r *Reader) Note_deletion() { r.progressDeletionAt = time.Now() }
 
 // A recent deletion key alone is insufficient: match the actual cursor-row
 // deletion so background progress, including another row in the same snapshot,
-// remains available to the detector. Automatic deletion speech is unchanged.
-func (r *Reader) progress_deletion_row(previous, next screen.Snapshot) int {
+// remains available to the detector. The same evidence permits deletion echo
+// while automatic reading is disabled, without speaking other screen changes.
+func (r *Reader) match_deletion(previous, next screen.Snapshot) []rune {
 	if r.progressDeletionAt.IsZero() || time.Since(r.progressDeletionAt) > echoWindow || previous.Y != next.Y || next.X > previous.X {
-		return -1
+		return nil
 	}
 	before, after := previous.Line(next.Y), next.Line(next.Y)
 	count := previous.X - next.X
@@ -61,8 +62,8 @@ func (r *Reader) progress_deletion_row(previous, next screen.Snapshot) int {
 	}
 	if count <= 0 || next.X+count > next.Cols || !slices.Equal(before[:next.X], after[:next.X]) ||
 		!slices.Equal(before[next.X+count:], after[next.X:next.Cols-count]) || !all_spaces(after[next.Cols-count:]) {
-		return -1
+		return nil
 	}
 	r.progressDeletionAt = time.Time{}
-	return next.Y
+	return before[next.X : next.X+count]
 }