Enable DuplicateProperty scss-lint

.scss-lint.yml

@@ -57,7 +57,7 @@ linters:
 
   # Reports when you define the same property twice in a single rule set.
   DuplicateProperty:
-    enabled: false
+    enabled: true
 
   # Separate rule, function, and mixin declarations with empty lines.
   EmptyLineBetweenBlocks:

app/assets/stylesheets/framework/blocks.scss

@@ -23,7 +23,6 @@
 
 .row-content-block {
   margin-top: 0;
-  margin-bottom: -$gl-padding;
   background-color: $gray-light;
   padding: $gl-padding;
   margin-bottom: 0;

app/assets/stylesheets/framework/emojis.scss

 gl-emoji {
-  display: inline-block;
   display: inline-flex;
   vertical-align: middle;
   font-family: "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

app/assets/stylesheets/framework/lists.scss

@@ -11,7 +11,6 @@
   > li {
     padding: 10px 15px;
     min-height: 20px;
-    border-bottom: 1px solid $list-border-light;
     border-bottom: 1px solid $list-border;
 
     &::after {

app/assets/stylesheets/framework/selects.scss

@@ -96,7 +96,6 @@
 
     .select2-search-field input {
       padding: 5px $gl-padding / 2;
-      font-size: 13px;
       height: auto;
       font-family: inherit;
       font-size: inherit;

app/assets/stylesheets/pages/boards.scss

@@ -72,7 +72,9 @@
 
   @media (min-width: $screen-sm-min) {
     height: 475px; // Needed for PhantomJS
+    // scss-lint:disable DuplicateProperty
     height: calc(100vh - 222px);
+    // scss-lint:enable DuplicateProperty
     min-height: 475px;
     transition: width .2s;
 

app/assets/stylesheets/pages/ci_projects.scss

@@ -36,7 +36,6 @@
     pre.commit-message {
       background: none;
       padding: 0;
-      margin: 0;
       border: none;
       margin: 20px 0;
       border-radius: 0;

app/assets/stylesheets/pages/diff.scss

@@ -94,7 +94,6 @@
     .old_line,
     .new_line {
       margin: 0;
-      padding: 0;
       border: none;
       padding: 0 5px;
       border-right: 1px solid;

app/assets/stylesheets/pages/issues.scss

@@ -204,7 +204,6 @@ ul.related-merge-requests > li {
   .dropdown-toggle {
     .fa-caret-down {
       pointer-events: none;
-      margin-left: 0;
       color: inherit;
       margin-left: 0;
     }

app/assets/stylesheets/pages/projects.scss

@@ -247,7 +247,6 @@
       font-size: 13px;
       font-weight: 600;
       line-height: 13px;
-      padding: $gl-vert-padding $gl-padding;
       letter-spacing: .4px;
       padding: 6px 14px;
       text-align: center;