luci-app-opkg: allow presetting filter via query attribute

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

applications/luci-app-opkg/htdocs/luci-static/resources/view/opkg.js

@@ -793,7 +793,7 @@ window.requestAnimationFrame(function() {
 	var filter = document.querySelector('input[name="filter"]'),
 	    keyTimeout = null;
 
-	filter.value = '';
+	filter.value = filter.getAttribute('value');
 	filter.addEventListener('keyup',
 		function(ev) {
 			if (keyTimeout !== null)

applications/luci-app-opkg/luasrc/view/opkg.htm

@@ -93,7 +93,7 @@
 
 	<div>
 		<label><%:Filter%>:</label>
-		<input type="text" name="filter" placeholder="<%:Type to filter…%>" /><!--
+		<input type="text" name="filter" placeholder="<%:Type to filter…%>"<%=attr("value", luci.http.formvalue("query") or "")%> /><!--
 		--><button class="btn cbi-button" onclick="handleReset(event)"><%:Clear%></button>
 	</div>