Custom geometry: 'E' is an exponent only when digits follow, so 'M 0 0E' keeps its end command

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/pptx/src/custgeom.rs

@@ -329,10 +329,19 @@ pub fn parse_path(d: &str) -> Vec<(char, Vec<f64>)> {
             token.clear();
         }
     };
-    for ch in d.chars() {
+    let cs: Vec<char> = d.chars().collect();
+    for (i, &ch) in cs.iter().enumerate() {
         match ch {
-            // An 'E' inside a number is an exponent, not the end command.
-            'E' if !token.is_empty() => token.push(ch),
+            // An 'E' inside a number followed by a digit (or a sign and a digit) is an exponent,
+            // not the end command.
+            'E' if !token.is_empty() && {
+                let n1 = cs.get(i + 1).copied().unwrap_or(' ');
+                let n2 = cs.get(i + 2).copied().unwrap_or(' ');
+                n1.is_ascii_digit() || ((n1 == '-' || n1 == '+') && n2.is_ascii_digit())
+            } =>
+            {
+                token.push(ch)
+            }
             'M' | 'L' | 'C' | 'Q' | 'Z' | 'm' | 'l' | 'c' | 'q' | 'z' | 'E' => {
                 push_tok(&mut token, &mut nums);
                 flush(cmd, &mut nums, &mut out);
@@ -479,6 +488,8 @@ mod tests {
         assert_eq!(parse_path("M 1E-5 2 L 3 4"), vec![('M', vec![1e-5, 2.0]), ('L', vec![3.0, 4.0])]);
         assert_eq!(parse_path("M 1.5E3 2"), vec![('M', vec![1500.0, 2.0])]);
         assert_eq!(parse_path("M 1e-5 2"), vec![('M', vec![1e-5, 2.0])]);
+        // An 'E' right after a number with no exponent digits is the end command.
+        assert_eq!(parse_path("M 0 0E"), vec![('M', vec![0.0, 0.0]), ('E', vec![])]);
     }
 
     #[test]