one more fetch algo fix

config.txt

@@ -1,4 +1,4 @@
-useragent "curl/7.54.2"
+useragent "tii/current"
 proxyhost ""
 proxyport "0"
 tiix_font "Fira Code"

tiifetch.tcl

@@ -245,7 +245,8 @@ proc fetchiidb {url echos dbdir dolog} {
     # pre-filter the new message IDs to fetch
     set newmsgids [listcomp $msgids $oldmsgids] 
     # save the echo index file with all message IDs
-    writefileln $echofile [join $msgids "\n"]
+    set msgids [list {*}$oldmsgids {*}$newmsgids]
+    writefileln $echofile [string cat [string trimright [join $msgids "\n"]] "\n"]
     if {$dolog eq 1} {puts "Fetching [llength $newmsgids] new messages from $echoname..."}
     set idgroups ""
     set grcount 0