fix: SlackRichTextList elements type (#359)

* fix: SlackRichTextList elements type

* chore: An example update

Author: abdolence

examples/socket_mode.rs

@@ -194,6 +194,34 @@ impl SlackBlocksTemplate for SlackHomeTabBlocksTemplateExample {
                             .into()
                         )
                         .into(),
+                        SlackRichTextList::new(
+                            SlackRichTextListStyle::Bullet,
+                            vec![
+                                SlackRichTextSection::new(
+                                    vec![SlackRichTextInlineElement::Text(SlackRichTextText::new(
+                                        "Item 1".into()
+                                    ))]
+                                    .into(),
+                                )
+                                .into(),
+                                SlackRichTextSection::new(
+                                    vec![SlackRichTextInlineElement::Text(SlackRichTextText::new(
+                                        "Item 2".into()
+                                    ))]
+                                    .into(),
+                                )
+                                .into()
+                            ]
+                            .into()
+                        )
+                        .into(),
+                        SlackRichTextPreformatted::new(
+                            vec![SlackRichTextInlineElement::Text(SlackRichTextText::new(
+                                "Let's use some preformatted text: ".into()
+                            ))]
+                            .into(),
+                        )
+                        .into(),
                     ]
                     .into()
                 ))

src/models/blocks/kit.rs

@@ -1133,12 +1133,25 @@ pub struct SlackRichTextSection {
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Builder)]
 pub struct SlackRichTextList {
     pub style: SlackRichTextListStyle,
-    pub elements: Vec<SlackRichTextSection>,
+    pub elements: Vec<SlackRichTextListElement>,
     pub indent: Option<u64>,
     pub offset: Option<u64>,
     pub border: Option<u64>,
 }
 
+#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum SlackRichTextListElement {
+    #[serde(rename = "rich_text_section")]
+    Section(SlackRichTextSection),
+}
+
+impl From<SlackRichTextSection> for SlackRichTextListElement {
+    fn from(element: SlackRichTextSection) -> Self {
+        SlackRichTextListElement::Section(element)
+    }
+}
+
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum SlackRichTextListStyle {
@@ -1492,6 +1505,16 @@ mod test {
         assert_eq!(list.style, SlackRichTextListStyle::Bullet);
         assert_eq!(list.elements.len(), 2);
 
+        // list items are SlackRichTextElement::Section
+        assert!(matches!(
+            &list.elements[0],
+            SlackRichTextListElement::Section(_)
+        ));
+        assert!(matches!(
+            &list.elements[1],
+            SlackRichTextListElement::Section(_)
+        ));
+
         // preformatted
         assert!(matches!(
             &rich.elements[2],