api: Emit AccountsItemChanged when own key is generated/imported, use gray self-color until that (#7296)

Emitting an `AccountsItemChanged` event is needed for UIs to know when `Contact::get_color()` starts
returning the true color for `SELF`. Before, an address-based color was returned for a new account
which was changing to a fingerprint-based color e.g. on app restart. Now the self-color is our
favorite gray until own keypair is generated or imported e.g. via ASM.

Author: iequidoo

src/contact.rs

@@ -1582,6 +1582,8 @@ impl Contact {
     pub fn get_color(&self) -> u32 {
         if let Some(fingerprint) = self.fingerprint() {
             str_to_color(&fingerprint.hex())
+        } else if self.id == ContactId::SELF {
+            0x808080
         } else {
             str_to_color(&self.addr.to_lowercase())
         }

src/key.rs

@@ -15,6 +15,7 @@ use rand::thread_rng;
 use tokio::runtime::Handle;
 
 use crate::context::Context;
+use crate::events::EventType;
 use crate::log::{LogExt, info};
 use crate::pgp::KeyPair;
 use crate::tools::{self, time_elapsed};
@@ -414,15 +415,11 @@ pub(crate) async fn store_self_keypair(context: &Context, keypair: &KeyPair) ->
                 "INSERT INTO config (keyname, value) VALUES ('key_id', ?)",
                 (new_key_id,),
             )?;
-            Ok(Some(new_key_id))
+            Ok(new_key_id)
         })
         .await?;
-
-    if let Some(new_key_id) = new_key_id {
-        // Update config cache if transaction succeeded and changed current default key.
-        config_cache_lock.insert("key_id".to_string(), Some(new_key_id.to_string()));
-    }
-
+    context.emit_event(EventType::AccountsItemChanged);
+    config_cache_lock.insert("key_id".to_string(), Some(new_key_id.to_string()));
     Ok(())
 }