implement automatic precaching for next normal and unread feeds

allow opening cached next_unread_feed on f-q if available
tweak getRelativeArticles() to scan forward only
reenable prefetch_old server requests

1 files changed, 3 insertions, 1 deletions

diff --git a/tt-rss.js b/tt-rss.js
index c8f4ab83e..3e0e95919 100644
--- a/tt-rss.js
+++ b/tt-rss.js
@@ -330,7 +330,9 @@ function init_second_stage() {
 
 		loading_set_progress(30);
 
-		cache_clear();
+		// can't use cache_clear() here because viewfeed might not have initialized yet
+		if ('sessionStorage' in window && window['sessionStorage'] !== null)
+			sessionStorage.clear();
 
 		console.log("second stage ok");