Base syntax on CSS of ST4174

ST4174 introduced support for relaxed CSS nesting which basically means,
full PostCSS like nesting of selectors and rules.

This reduces Tailwind CSS to just adding some additional at-rules.

All other structure modifying context overrides are removed to ensure
compatibility with core CSS.

.github/workflows/ci-syntax-tests.yml

@@ -27,18 +27,12 @@ jobs:
     strategy:
       matrix:
         include:
-          - build: 4107
-            default_packages: v4107
-          - build: 4126
-            default_packages: v4126
-          - build: 4143
-            default_packages: v4143
-          - build: 4152
-            default_packages: v4152
-          - build: 4169
-            default_packages: v4169
-          - build: 4173
-            default_packages: v4173
+          - build: 4174  # first supported build
+            default_packages: v4174
+          - build: 4180  # first stable build
+            default_packages: v4180
+          - build: latest
+            default_packages: master
     steps:
       - name: Checkout Default Packages
         uses: actions/checkout@v4

Tailwind CSS.sublime-syntax

@@ -9,35 +9,8 @@ extends: Packages/CSS/CSS.sublime-syntax
 file_extensions:
   - tailwind.css
 
-variables:
-
-  # Block punctuations
-  #  Provides an easy and safe interface for template syntaxes to override
-  #  block punctuation patterns to prevent ambiguities with interpolations.
-  #  It helps to correctly highlight {{ tag }} { {{prop}}: {{value}} }
-  block_start: \{
-  block_end: \}
-
-  # Properties and Selectors
-  property_or_selector_begin: (?={{ident_begin}}|{{selector_start}})
-  property_end: (?=[;@)}])
-
-  selector_start: '[[:alpha:].:#&*\[{{combinator_char}}]'
-  selector_end: (?=[;@(){}])
-
 contexts:
 
-  stylesheet:
-    # relaxed properties vs. selectors
-    - meta_include_prototype: false
-    - include: comments
-    - include: properties-or-selectors
-    - include: at-rules
-    - include: property-lists
-    - include: rule-terminators
-    - include: illegal-commas
-    - include: illegal-groups
-
 ###[ CSS AT RULES ]############################################################
 
   at-other:
@@ -49,66 +22,6 @@ contexts:
     - include: tailwind-at-variants
     - include: tailwind-at-screen
 
-###[ CSS SELECTORS ]###########################################################
-
-  properties-or-selectors:
-    # required until ST4174 (PR #3898)
-    - match: '{{property_or_selector_begin}}'
-      branch_point: property-or-selector
-      branch:
-        - maybe-property
-        - selector-body
-
-  maybe-property:
-    # required until ST4174 (PR #3898)
-    - meta_include_prototype: false
-    - include: property-end
-    - include: property-identifiers
-    - match: ''
-      fail: property-or-selector
-
-  property-end:
-    # required until ST4174 (PR #3898)
-    - match: '{{property_end}}'
-      pop: 1
-
-  selector-variables:
-    # required until ST4174 (PR #3898)
-    - meta_prepend: true
-    - match: \&
-      scope: variable.language.parent.css
-
-###[ CSS STYLESHEET BLOCKS ]####################################################
-
-  maybe-stylesheet-block:
-    # required until ST4174 (PR #3831)
-    - meta_include_prototype: false
-    - match: '{{block_start}}'
-      scope: punctuation.section.block.begin.css
-      set: stylesheet-block-body
-    - include: comments
-    - include: else-pop
-
-  stylesheet-block-body:
-    # required until ST4174 (PR #3831)
-    - meta_include_prototype: false
-    - meta_scope: meta.block.css
-    - include: block-end
-    - include: stylesheet
-
-###[ CSS PROPERTY LISTS ]######################################################
-
-  property-list-body:
-    # relaxed properties vs. selectors
-    - meta_scope: meta.property-list.css meta.block.css
-    - include: block-end
-    - include: stylesheet
-
-  illegal-commas:
-    # required until ST4174 (PR #3831)
-    - match: ','
-      scope: invalid.illegal.unexpected-token.css
-
 ###[ TAILWIND INLINE AT RULES ]################################################
 
   tailwind-at-apply: