Merge https://github.com/less/less.js into nested-parent-selector-2026-v1

Conflicts:
	lib/less/parser/parser.js
	lib/less/tree/ruleset.js

test/css/comments.css

@@ -80,3 +80,4 @@
 #output-block {
   comment: /* // Not commented out // */;
 }
+/*comment on last line*/

test/css/functions.css

@@ -127,6 +127,7 @@
   mixt: rgba(255, 0, 0, 0.5);
 }
 #built-in .is-a {
+  ruleset: true;
   color: true;
   color1: true;
   color2: true;

test/css/import-reference.css

@@ -34,6 +34,14 @@ div#id.class[a=1][b=2].class:not(1) {
 .visible + .visible .sub {
   color: green;
 }
+@supports (something: else) {
+  .class {
+    something: else;
+  }
+  .nestedToo .class {
+    something: else;
+  }
+}
 .b {
   color: red;
   color: green;
@@ -66,3 +74,20 @@ div#id.class[a=1][b=2].class:not(1) {
     color: red;
   }
 }
+.test {
+  color: red;
+}
+.test:first-child {
+  color: blue;
+}
+@keyframes some-name {
+  property: value;
+}
+@supports (animation-name: test) {
+  @keyframes some-name {
+    property: value;
+  }
+  .selector {
+    color: red;
+  }
+}

test/css/mixins-important.css

@@ -43,3 +43,9 @@
 .class .inner {
   test: 9;
 }
+.when-calling-nested-issue-2394 {
+  width: auto !important;
+}
+.when-calling-nested-with-param-issue-2394 {
+  width: 10px !important;
+}

test/css/selectors.css

@@ -119,7 +119,7 @@ p a span {
 .bloodred {
   color: green;
 }
-#blood.blood.red.black {
+#blood.blood.red.black:blood {
   color: black;
 }
 :nth-child(3) {

test/css/urls.css

@@ -57,6 +57,7 @@
 }
 #data-uri {
   uri: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
+  background-image: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg=="), url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==");
   uri-fragment: url("data:image/jpeg;base64,bm90IGFjdHVhbGx5IGEganBlZyBmaWxlCg==#fragment");
 }
 #data-uri-guess {