Indicate encryption state of room in messagebar (#522)

src/windows/room/chat.rs

@@ -7,7 +7,9 @@ use std::path::{Path, PathBuf};
 
 use edit::edit_with_builder as external_edit;
 use edit::Builder;
+use matrix_sdk::EncryptionState;
 use modalkit::editing::store::RegisterError;
+use ratatui::style::{Color, Style};
 use std::process::Command;
 use tokio;
 use url::Url;
@@ -975,7 +977,16 @@ impl StatefulWidget for Chat<'_> {
             Paragraph::new(desc_spans).render(descarea, buf);
         }
 
-        let prompt = if self.focused { "> " } else { "  " };
+        let prompt = match (self.focused, state.room().encryption_state()) {
+            (false, _) => Span::raw("  "),
+            (_, EncryptionState::Encrypted) => {
+                Span::styled("\u{1F512}\u{FE0E} ", Style::new().fg(Color::LightGreen))
+            },
+            (_, EncryptionState::NotEncrypted) => {
+                Span::styled("\u{1F513}\u{FE0E} ", Style::new().fg(Color::Red))
+            },
+            (_, EncryptionState::Unknown) => Span::styled("> ", Style::new().fg(Color::Red)),
+        };
 
         let tbox = TextBox::new().prompt(prompt);
         tbox.render(textarea, buf, &mut state.tbox);

src/worker.rs

@@ -283,6 +283,9 @@ async fn load_older_one(
     limit: u32,
 ) -> MessageFetchResult {
     if let Some(room) = client.get_room(room_id) {
+        // Update cached encryption state. This is a noop if the state is already cached.
+        let _ = room.request_encryption_state().await;
+
         let mut opts = match &fetch_id {
             Some(id) => MessagesOptions::backward().from(id.as_str()),
             None => MessagesOptions::backward(),