Fix parsing of @Keyframes rules

Before 23ed111 "CSS: Improve handling
of generic-at-rules (for example used by tailwind)" the CSS parser
returned the body of generic @-rules as a plain list of tokens. That
changed and the @Keyframes rule needs to be special cased. There was
already a special case for the @-webkit-keyframes variant, which is
identical to the final variant and differs only in the introducing
rule name.

The vendored variants @-moz-keyframes and @-o-keyframes are also
supported.

Closes: apache#8052

ide/css.lib/nbproject/project.properties

@@ -15,7 +15,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
-javac.source=1.8
+javac.release=17
 javac.compilerargs=-Xlint -Xlint:-serial
 is.autoload=true
 

ide/css.lib/src/org/netbeans/modules/css/lib/Css3.g

@@ -731,7 +731,7 @@ moz_document_function
 //http://developer.apple.com/library/safari/#documentation/appleapplications/reference/SafariCSSRef/Articles/OtherStandardCSS3Features.html#//apple_ref/doc/uid/TP40007601-SW1
 webkitKeyframes
 	:
-	WEBKIT_KEYFRAMES_SYM ws? atRuleId ws?
+	( WEBKIT_KEYFRAMES_SYM | KEYFRAMES_SYM | {tokenNameEquals("@-moz-keyframes")}? AT_IDENT | {tokenNameEquals("@-o-keyframes")}? AT_IDENT ) ws? atRuleId ws?
 	LBRACE ws?
 		( webkitKeyframesBlock ws? )*
 	RBRACE
@@ -1261,7 +1261,7 @@ cp_variable_declaration
 cp_variable
     :
         //every token which might possibly begin with the at sign
-        {isLessSource()}? ( AT_IDENT | IMPORT_SYM | PAGE_SYM | MEDIA_SYM | NAMESPACE_SYM | CHARSET_SYM | COUNTER_STYLE_SYM | FONT_FACE_SYM | TOPLEFTCORNER_SYM | TOPLEFT_SYM | TOPCENTER_SYM | TOPRIGHT_SYM | TOPRIGHTCORNER_SYM | BOTTOMLEFTCORNER_SYM | BOTTOMLEFT_SYM | BOTTOMCENTER_SYM | BOTTOMRIGHT_SYM | BOTTOMRIGHTCORNER_SYM | LEFTTOP_SYM | LEFTMIDDLE_SYM | LEFTBOTTOM_SYM | RIGHTTOP_SYM | RIGHTMIDDLE_SYM | RIGHTBOTTOM_SYM | MOZ_DOCUMENT_SYM | WEBKIT_KEYFRAMES_SYM | SASS_CONTENT | SASS_MIXIN | SASS_INCLUDE | SASS_EXTEND | SASS_DEBUG | SASS_WARN | SASS_IF | SASS_ELSE | SASS_FOR | SASS_FUNCTION | SASS_RETURN | SASS_EACH | SASS_WHILE | SASS_AT_ROOT | SASS_USE | SASS_FORWARD )
+        {isLessSource()}? ( AT_IDENT | IMPORT_SYM | PAGE_SYM | MEDIA_SYM | NAMESPACE_SYM | CHARSET_SYM | COUNTER_STYLE_SYM | FONT_FACE_SYM | TOPLEFTCORNER_SYM | TOPLEFT_SYM | TOPCENTER_SYM | TOPRIGHT_SYM | TOPRIGHTCORNER_SYM | BOTTOMLEFTCORNER_SYM | BOTTOMLEFT_SYM | BOTTOMCENTER_SYM | BOTTOMRIGHT_SYM | BOTTOMRIGHTCORNER_SYM | LEFTTOP_SYM | LEFTMIDDLE_SYM | LEFTBOTTOM_SYM | RIGHTTOP_SYM | RIGHTMIDDLE_SYM | RIGHTBOTTOM_SYM | MOZ_DOCUMENT_SYM | WEBKIT_KEYFRAMES_SYM | SASS_CONTENT | SASS_MIXIN | SASS_INCLUDE | SASS_EXTEND | SASS_DEBUG | SASS_WARN | SASS_IF | SASS_ELSE | SASS_FOR | SASS_FUNCTION | SASS_RETURN | SASS_EACH | SASS_WHILE | SASS_AT_ROOT | SASS_USE | SASS_FORWARD | KEYFRAMES_SYM )
         |
         {isScssSource()}? ( SASS_VAR | IDENT DOT SASS_VAR )
     ;
@@ -2003,6 +2003,7 @@ FONT_FACE_SYM       : '@FONT-FACE';
 SUPPORTS_SYM        : '@SUPPORTS';
 LAYER_SYM           : '@LAYER';
 CONTAINER_SYM       : '@CONTAINER';
+KEYFRAMES_SYM       : '@KEYFRAMES';
 
 TOPLEFTCORNER_SYM     :'@TOP-LEFT-CORNER';
 TOPLEFT_SYM           :'@TOP-LEFT';