add Message.post_message_view_type to jsonrpc api, to get the real viewtype of a pre-message.

deltachat-jsonrpc/src/api/types/message.rs

@@ -48,6 +48,9 @@ pub struct MessageObject {
     has_location: bool,
     has_html: bool,
     view_type: MessageViewtype,
+    /// If message is a Pre-Message,
+    /// then this returns the viewtype it will have when it is downloaded.
+    post_message_view_type: Option<MessageViewtype>,
     state: u32,
 
     /// An error text, if there is one.
@@ -212,6 +215,7 @@ impl MessageObject {
             has_location: message.has_location(),
             has_html: message.has_html(),
             view_type: message.get_viewtype().into(),
+            post_message_view_type: message.get_post_message_viewtype().map(Into::into),
             state: message
                 .get_state()
                 .to_u32()
@@ -683,6 +687,9 @@ pub struct MessageInfo {
     rfc724_mid: String,
     server_urls: Vec<String>,
     hop_info: String,
+    /// If message is a Pre-Message,
+    /// then this returns the viewtype it will have when it is downloaded.
+    post_message_view_type: Option<MessageViewtype>,
 }
 
 impl MessageInfo {
@@ -706,6 +713,7 @@ impl MessageInfo {
             rfc724_mid: message.rfc724_mid().to_owned(),
             server_urls,
             hop_info,
+            post_message_view_type: message.get_post_message_viewtype().map(Into::into),
         })
     }
 }

src/message.rs

@@ -861,8 +861,7 @@ impl Message {
 
     /// If message is a Pre-Message,
     /// then this returns the viewtype it will have when it is downloaded.
-    #[cfg(test)]
+    pub fn get_post_message_viewtype(&self) -> Option<Viewtype> {
-    pub(crate) fn get_post_message_viewtype(&self) -> Option<Viewtype> {
         if self.download_state != DownloadState::Done {
             if let Some(viewtype) = self
                 .param