invalidate local cache when view mode/limit is changed

tt-rss.js

@@ -823,7 +823,14 @@ function collapse_feedlist() {
 	} catch (e) {
 		exception_error(e, "toggle_feedlist");
 	}
-
-
-
+}
+
+function viewModeChanged() {
+	cache_empty();
+	return viewCurrentFeed(0, '')
+}
+
+function viewLimitChanged() {
+	cache_empty();
+	return viewCurrentFeed(0, '')
 }

tt-rss.php

@@ -178,7 +178,7 @@ window.onload = init;
 		<?php } ?>
 
 		<?php echo __('View:') ?>
-		<select name="view_mode" onchange="viewCurrentFeed(0, '')">
+		<select name="view_mode" onchange="viewModeChanged()">
 			<option selected value="adaptive"><?php echo __('Adaptive') ?></option>
 			<option value="all_articles"><?php echo __('All Articles') ?></option>
 			<option value="marked"><?php echo __('Starred') ?></option>
@@ -202,7 +202,7 @@ window.onload = init;
 		}
 
 		print_select_hash("limit", $def_art_limit, $limits, 
-			'onchange="viewCurrentFeed(0, \'\')"');
+			'onchange="viewLimitChanged()"');
 	
 		?>		
 

viewfeed.js

@@ -1508,6 +1508,10 @@ function cache_expire() {
 	}
 }
 
+function cache_empty() {
+	article_cache = new Array();
+}
+
 function cache_invalidate(id) {
 	var i = 0