add bubbling for @container like @media

Author: volker

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

@@ -220,7 +220,7 @@ void appendTo( @Nullable String[] mainSelector, CssFormatter formatter ) {
     private void bubbling( String[] mediaSelector, String[] blockSelector, CssFormatter formatter ) {
         if( properties.size() > 0 ) {
             String media = mediaSelector[0];
-            if( media.startsWith( "@media" ) || media.startsWith( "@supports" ) || media.startsWith( "@document" ) ) {
+            if( media.startsWith( "@media" ) || media.startsWith( "@supports" ) || media.startsWith( "@document" ) || media.startsWith( "@container" ) ) {
                 // conditional directives
                 int size0 = formatter.getOutputSize();
                 CssFormatter block = formatter.startBlock( mediaSelector );

test/com/inet/lib/less/samples/general/parenthesis.css

@@ -6,6 +6,11 @@
     background-size: 123 456;
   }
 }
+@container sidebar (width > 400px) {
+  .container-fixed {
+    back-color: red;
+  }
+}
 @media print {
   .visible-print {
     display: block !important;

test/com/inet/lib/less/samples/general/parenthesis.less

@@ -5,6 +5,9 @@
   only screen and ( min-resolution: 192dpi) {
     background-size: 123 456;
   }
+  @container sidebar (width > 400px) {
+    back-color: red;
+  }
 }
 
 .responsive-visibility() {