fix: Always pass the correct sort timestamp to ChatId::set_protection() (#5088)

Before in some places it was correctly calculated by passing the "sent" timestamp to
`calc_sort_timestamp()`, but in other places just the system time was used. In some complex
scenarios like #5088 (restoration of a backup made before a contact verification) it led to wrong
sort timestamps of protection messages and also messages following by them.

But to reduce number of args passed to functions needing to calculate the sort timestamp, add
message timestamps to `struct MimeMessage` which is anyway passed everywhere.

src/mimeparser.rs

@@ -1,5 +1,6 @@
 //! # MIME message parsing module.
 
+use std::cmp::min;
 use std::collections::{HashMap, HashSet};
 use std::future::Future;
 use std::path::Path;
@@ -37,8 +38,8 @@ use crate::simplify::{simplify, SimplifiedText};
 use crate::stock_str;
 use crate::sync::SyncItems;
 use crate::tools::{
-    create_smeared_timestamp, get_filemeta, parse_receive_headers, strip_rtlo_characters,
-    truncate_by_lines,
+    create_smeared_timestamp, get_filemeta, parse_receive_headers, smeared_time,
+    strip_rtlo_characters, truncate_by_lines,
 };
 use crate::{location, tools};
 
@@ -118,6 +119,12 @@ pub(crate) struct MimeMessage {
 
     /// Whether the contact sending this should be marked as bot.
     pub(crate) is_bot: bool,
+
+    /// When the message was received, in secs since epoch.
+    pub(crate) timestamp_rcvd: i64,
+    /// Sender timestamp in secs since epoch. Allowed to be in the future due to unsynchronized
+    /// clocks, but not too much.
+    pub(crate) timestamp_sent: i64,
 }
 
 #[derive(Debug, PartialEq)]
@@ -386,6 +393,12 @@ impl MimeMessage {
         // Auto-submitted is also set by holiday-notices so we also check `chat-version`
         let is_bot = headers.contains_key("auto-submitted") && headers.contains_key("chat-version");
 
+        let timestamp_rcvd = smeared_time(context);
+        let timestamp_sent = headers
+            .get(HeaderDef::Date.get_headername())
+            .and_then(|value| mailparse::dateparse(value).ok())
+            .map_or(timestamp_rcvd, |value| min(value, timestamp_rcvd + 60));
+
         let mut parser = MimeMessage {
             parts: Vec::new(),
             headers,
@@ -415,6 +428,8 @@ impl MimeMessage {
             decoded_data: Vec::new(),
             hop_info,
             is_bot,
+            timestamp_rcvd,
+            timestamp_sent,
         };
 
         match partial {
@@ -1630,13 +1645,7 @@ impl MimeMessage {
     /// Handle reports
     /// (MDNs = Message Disposition Notification, the message was read
     /// and NDNs = Non delivery notification, the message could not be delivered)
-    pub async fn handle_reports(
-        &self,
-        context: &Context,
-        from_id: ContactId,
-        sent_timestamp: i64,
-        parts: &[Part],
-    ) {
+    pub async fn handle_reports(&self, context: &Context, from_id: ContactId, parts: &[Part]) {
         for report in &self.mdn_reports {
             for original_message_id in report
                 .original_message_id
@@ -1644,7 +1653,7 @@ impl MimeMessage {
                 .chain(&report.additional_message_ids)
             {
                 if let Err(err) =
-                    handle_mdn(context, from_id, original_message_id, sent_timestamp).await
+                    handle_mdn(context, from_id, original_message_id, self.timestamp_sent).await
                 {
                     warn!(context, "Could not handle MDN: {err:#}.");
                 }