Fix settings completions with spaces before comma

Set a new meta scope for the region after the value up to and including
the following comma. This way we can easily target the whole thing with
our completions.

Fixes #147.

Author: FichteFoll

Package/Sublime JSON/Sublime JSON.sublime-syntax

@@ -401,17 +401,20 @@ contexts:
       scope: invalid.illegal.expected-colon.json
 
   in-mapping-expect-comma:
-    - include: comments
-    - match: ','
-      scope: punctuation.separator.mapping.pair.json
-      pop: true
-    - match: (?=})
-      pop: true
-    - match: \s*(?=")
-      scope: invalid.illegal.expected-comma.inside-mapping.json
-      pop: true
-    - match: \S
-      scope: invalid.illegal.expected-comma.inside-mapping.json
+    - match: ''
+      set:
+        - meta_scope: meta.expect-comma.sublime
+        - include: comments
+        - match: ','
+          scope: punctuation.separator.mapping.pair.json
+          pop: true
+        - match: (?=})
+          pop: true
+        - match: \s*(?=")
+          scope: invalid.illegal.expected-comma.inside-mapping.json
+          pop: true
+        - match: \S
+          scope: invalid.illegal.expected-comma.inside-mapping.json
 
   mapping-value-meta:
     - clear_scopes: 1

Package/Sublime Text Settings/syntax_test_settings.json

@@ -11,16 +11,18 @@ s
 // <- meta.mapping.json punctuation.section.mapping.begin.json
 // ^ meta.mapping.json comment.line.double-slash.js punctuation.definition.comment.json
 
-    "key": "value",
+    "key": "value"  ,
 // ^^^^^^^^^^^^^^^^^ meta.mapping - meta.mapping meta.mapping
 //  ^^^^^ meta.mapping.key.json string.quoted.double.json - meta.mapping.json
 //  ^ punctuation.definition.string.begin.json
 //      ^ punctuation.definition.string.end.json
 //       ^ punctuation.separator.mapping.key-value.json
 //         ^^^^^^^ meta.setting-value.sublime-settings meta.mapping.value.json string.quoted.double.json
-//                ^ punctuation.separator.mapping.pair.json
+//                  ^ punctuation.separator.mapping.pair.json
 //       ^ - meta.expect-value.sublime-settings
 //        ^ meta.expect-value.sublime-settings
+//                ^^^ meta.expect-comma.sublime
+//                   ^ - meta.expect-comma.sublime
 
     "another_key": 123,
 //  ^ - entity.name.other.key.sublime-settings

plugins_/settings/region_math.py

@@ -1,13 +1,12 @@
-
 # match top-level keys only
 KEY_SCOPE = "entity.name.other.key.sublime-settings"
 KEY_COMPLETIONS_SCOPE = (
     "meta.settings-mapping.sublime-settings - comment - meta.setting-value.sublime-settings"
     " | " + KEY_SCOPE
 )
 VALUE_SCOPE = (
-    "meta.expect-value | meta.setting-value.sublime-settings"
-    " | punctuation.separator.mapping.pair.json"
+    "meta.expect-value.sublime-settings | meta.setting-value.sublime-settings"
+    " | meta.expect-comma.sublime"
 )