Don't create an mmultiscripts from an msub/msup with an empty base if there are no other children to with the script can be attached.

NSoiffer · NSoiffer · commit ea94de0bf363 · 2026-02-22T22:32:26.000-08:00
diff --git a/src/canonicalize.rs b/src/canonicalize.rs
@@ -2772,6 +2772,9 @@ impl CanonicalizeContext {
 		}
 
 		fn handle_convert_to_mmultiscripts(children: &mut Vec<ChildOfElement>) {
+			if children.len() == 1 {
+				return;		// can't convert to mmultiscripts if there is nothing to attach an empty base to
+			}
   			let mut i = 0;
 			// convert_to_mmultiscripts changes 'children', so can't cache length
 			while i < children.len() {

Original file line number	Diff line number	Diff line change
`@@ -2772,6 +2772,9 @@ impl CanonicalizeContext {`
`2772`	`2772`	`}`
`2773`	`2773`
`2774`	`2774`	`fn handle_convert_to_mmultiscripts(children: &mut Vec<ChildOfElement>) {`
	`2775`	`+ if children.len() == 1 {`
	`2776`	`+ return; // can't convert to mmultiscripts if there is nothing to attach an empty base to`
	`2777`	`+ }`
`2775`	`2778`	`let mut i = 0;`
`2776`	`2779`	`// convert_to_mmultiscripts changes 'children', so can't cache length`
`2777`	`2780`	`while i < children.len() {`