Revert "Revert "another attempt to workaround against feedtree scroll issues""

This reverts commit 9b176694f5.

Conflicts:
	tt-rss.css

tt-rss.css

@@ -770,6 +770,7 @@ div.fatalError textarea {
 	border-left-width : 0px;
 	border-bottom-width : 0px;
 	border-top-width : 0px;
+	overflow : auto;
 }
 
 #headlines-wrap-inner {
@@ -778,6 +779,10 @@ div.fatalError textarea {
 	border-width : 0px;
 }
 
+#feedTree {
+	overflow : visible;
+}
+
 #headlines-frame {
 	padding : 0px;
 	border-color : #88b0f0;