Guard with list expression. fix #51

Author: Horcrux7

src/com/inet/lib/less/Operation.java

@@ -440,6 +440,7 @@ public boolean booleanValue(CssFormatter formatter) {
             case '≤':
                 int type = maxOperadType( formatter );
                 switch( type ) {
+                    case LIST:
                     case STRING: {
                         // need to differ between keyword without quotes and strings with quotes. The type of quote is ignored
                         String left = normlizeQuotes( leftOp.stringValue( formatter ) );

test/com/inet/lib/less/samples/less_org_doc/guards/list.css

@@ -0,0 +1,3 @@
+.svy-sidenav-dropdown.sn-level-1:not(.svy-navitem-selected) {
+  padding: 0px 1px;
+}

test/com/inet/lib/less/samples/less_org_doc/guards/list.less

@@ -0,0 +1,4 @@
+@sidenav-selected-border-width: 0px 1px;
+.svy-sidenav-dropdown.sn-level-1:not(.svy-navitem-selected) when not(@sidenav-selected-border-width = 0) {
+   padding: @sidenav-selected-border-width 
+}