A refresh someone asks for reads the feeds in full (#77)

Check every feed, a feed's refresh, pull to refresh and ipx fetch --force
all send force, which only skipped the not-due wait: the request still
carried the stored ETag and Last-Modified, so an unchanged feed answered
304 and was not read. anil-dash got no site icon from a refresh for this
reason. A forced scan now drops the validators; the scheduled scan keeps
them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -34,6 +34,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   pinned: a tick when read, an envelope when not. It used to show the opposite.
 - In Directory and Popular, Subscribe is a plus again, not the tick that marks a feed you have.
 - A feed's refresh button looks like the buttons beside it, instead of standing out filled in.
+- Refreshing reads your feeds in full, instead of only asking each one whether it changed, so
+  a feed that has not changed is still read again.
 - A web page with some non-ASCII characters no longer hides the feed it links, or crashes looking for it.
 - Pulling the item list down to check for new items shows a spinner for a couple of seconds, and
   a second pull meanwhile does nothing, instead of no sign at all that the check started.

src/main.rs

@@ -48,7 +48,7 @@ enum Command {
     Fetch {
         /// Only this feed id
         feed: Option<String>,
-        /// Poll even when the feed is not due yet
+        /// Read the feed in full now, even when it is not due and has not changed
         #[arg(long)]
         force: bool,
     },
@@ -921,7 +921,13 @@ async fn fetch(ctx: &Arc<Ctx>, only: Option<&str>, force: bool, scope: &[String]
     };
     for sub in subs.iter().filter(|s| only.is_none_or(|o| o == s.id) && in_scope(s)) {
         let (id, feed_cfg) = (&sub.id, &sub.cfg);
-        let state = ctx.db.http_state(id).await?;
+        let mut state = ctx.db.http_state(id).await?;
+        // A scan someone asked for reads the feed in full. With the validators it only skipped the
+        // wait: a feed that had not changed answered 304 and nothing was read (#77).
+        if force {
+            state.etag = None;
+            state.last_modified = None;
+        }
 
         if !force && let Some(last) = state.last_checked {
             let due = last + due_after(&cfg, feed_cfg, state.ttl_mins) as i64;