Gap 19: a kept ODT form control made another kind saves as that kind

Review fix. A button kept verbatim was still written as the button
after its content control was made another kind (a check box, a list).
The kept form XML is now used only while the control is still the
plain text control it was read as.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GBVQLyDnrG8Tn1yDQcUabC

crates/formats/src/odt/forms.rs

@@ -242,8 +242,9 @@ pub(in crate::odt) fn form_xml(c: &ContentControl, text: &str, id: &str, n: usiz
             None => (xml, w, h),
         }
     };
-    // A control kept verbatim, with its new id.
-    if !c.form_xml.is_empty() {
+    // A control kept verbatim, with its new id, while it is still the control it was read as
+    // (made another kind, it is written as that).
+    if !c.form_xml.is_empty() && c.kind == (ControlKind::Text { multi_line: false }) {
         let end = c.form_xml.find(|ch: char| ch.is_whitespace() || ch == '>')?;
         let (head, rest) = (c.form_xml.get(..end)?, c.form_xml.get(end..)?);
         return Some(size((format!("{head} xml:id=\"{id}\" form:id=\"{id}\"{rest}"), 72.0, 20.0)));

crates/formats/src/odt/tests_more/forms.rs

@@ -130,6 +130,20 @@ fn buttons_are_kept() {
         "{c}"
     );
     assert!(c.contains(r#"svg:width="72pt" svg:height="21.6pt" draw:control="control1""#), "{c}");
+    // Made a check box, it is saved as one.
+    let mut c = wordcraft_doc::control::ContentControl::new(ControlKind::Text { multi_line: false });
+    c.form_xml = "<form:button form:name=\"Go\"></form:button>".into();
+    let kept = crate::odt::forms::form_xml(&c, "Go", "control1", 1).unwrap().0;
+    assert!(kept.starts_with(r#"<form:button xml:id="control1" form:id="control1" form:name="Go">"#), "{kept}");
+    c.kind = ControlKind::CheckBox {
+        checked: true,
+        checked_char: '\u{2612}',
+        checked_font: String::new(),
+        unchecked_char: '\u{2610}',
+        unchecked_font: String::new(),
+    };
+    let made = crate::odt::forms::form_xml(&c, "\u{2612}", "control1", 1).unwrap().0;
+    assert!(made.starts_with("<form:checkbox "), "{made}");
     // And again: still a button.
     let again = entry(&export(&import(&saved).unwrap()).unwrap(), "content.xml");
     assert_eq!(again.matches("<form:button ").count(), 1, "{again}");