Enable SpaceAroundOperator in scss-lint

.scss-lint.yml

@@ -201,7 +201,7 @@ linters:
   # Operators should be formatted with a single space on both sides of an
   # infix operator.
   SpaceAroundOperator:
-    enabled: false
+    enabled: true
   
   # Opening braces should be preceded by a single space.
   SpaceBeforeBrace:

app/assets/stylesheets/framework/modal.scss

@@ -3,7 +3,7 @@
   padding: 15px;
 
   .form-actions {
-    margin: -$gl-padding+1;
+    margin: -$gl-padding + 1;
     margin-top: 15px;
   }
 

app/assets/stylesheets/pages/note_form.scss

@@ -8,7 +8,7 @@
 .diff-file .diff-content {
   tr.line_holder:hover > td .line_note_link {
     opacity: 1.0;
-    filter: alpha(opacity=100);
+    filter: alpha(opacity = 100);
   }
 }