do not send selfavatar on existing installation without resetting

src/chat.rs

@@ -1598,6 +1598,16 @@ pub fn set_gossiped_timestamp(context: &Context, chat_id: u32, timestamp: i64) {
 }
 
 pub fn shall_attach_selfavatar(context: &Context, chat_id: u32) -> Result<bool, Error> {
+    // versions before 12/2019 already allowed to set selfavatar, however, it was never sent to others.
+    // to avoid sending out previously set selfavatars unexpectedly we added this additional check.
+    // it can be removed after some time.
+    if !context
+        .sql
+        .get_raw_config_bool(context, "attach_selfavatar")
+    {
+        return Ok(false);
+    }
+
     let resend_every_days = 14;
     let timestamp_some_days_ago = time() - resend_every_days * 24 * 60 * 60;
     let needs_attach = context.sql.query_map(
@@ -2485,6 +2495,8 @@ mod tests {
         let (contact_id, _) =
             Contact::add_or_lookup(&t.ctx, "", "foo@bar.org", Origin::IncomingUnknownTo).unwrap();
         add_contact_to_chat(&t.ctx, chat_id, contact_id);
+        assert!(!shall_attach_selfavatar(&t.ctx, chat_id).unwrap());
+        t.ctx.set_config(Config::Selfavatar, None).unwrap(); // setting to None also forces re-sending
         assert!(shall_attach_selfavatar(&t.ctx, chat_id).unwrap());
 
         assert!(set_selfavatar_timestamp(&t.ctx, chat_id, time()).is_ok());

src/config.rs

@@ -128,12 +128,18 @@ impl Context {
     /// If `None` is passed as a value the value is cleared and set to the default if there is one.
     pub fn set_config(&self, key: Config, value: Option<&str>) -> crate::sql::Result<()> {
         match key {
-            Config::Selfavatar if value.is_some() => {
+            Config::Selfavatar => {
-                let blob = BlobObject::new_from_path(&self, value.unwrap())?;
-                let ret = self.sql.set_raw_config(self, key, Some(blob.as_name()));
                 self.sql
                     .execute("UPDATE contacts SET selfavatar_sent=0;", NO_PARAMS)?;
-                ret
+                self.sql
+                    .set_raw_config_bool(self, "attach_selfavatar", true)?;
+                match value {
+                    Some(value) => {
+                        let blob = BlobObject::new_from_path(&self, value)?;
+                        self.sql.set_raw_config(self, key, Some(blob.as_name()))
+                    }
+                    None => self.sql.set_raw_config(self, key, None),
+                }
             }
             Config::InboxWatch => {
                 let ret = self.sql.set_raw_config(self, key, value);