.ai save: check a frame's segment count before building its path

A frame or path past the segments the reader reads is rejected from its count, before it is copied and converted.

crates/eps/src/ai_editing/tests.rs

@@ -3487,7 +3487,7 @@ fn an_open_frame_whose_ends_meet_is_written_as_its_outlines() {
     let open = |r: Rect| {
         let mut frame = shapes::rectangle(r);
         frame.subpaths[0].closed = false;
-        let start = frame.subpaths[0].anchors[0].clone();
+        let start = frame.subpaths[0].anchors[0];
         frame.subpaths[0].anchors.push(start);
         frame
     };

crates/eps/src/ai_editing/writer/texts.rs

@@ -445,7 +445,7 @@ fn strong_direction(c: char) -> Option<bool> {
 /// document is one path), of no more segments than the reader reads.
 fn segments(path: &PathData) -> Option<Vec<[f64; 8]>> {
     let mut drawn = path.subpaths.iter().filter(|sp| !sp.anchors.is_empty());
-    let sp = drawn.next().filter(|sp| sp.anchors.len() > 1)?;
+    let sp = drawn.next().filter(|sp| sp.anchors.len() > 1 && sp.segment_count() <= crate::import::MAX_SEGMENTS)?;
     if drawn.next().is_some() {
         return None;
     }