Simplify table state styles

less/mixins.less

@@ -430,27 +430,27 @@
 
 // Tables
 // -------------------------
-.table-row-variant(@state; @background; @border) {
+.table-row-variant(@state; @background) {
   // Exact selectors below required to override `.table-striped` and prevent
   // inheritance to nested tables.
-  .table > thead > tr,
-  .table > tbody > tr,
-  .table > tfoot > tr {
-    > td.@{state},
-    > th.@{state},
-    &.@{state} > td,
-    &.@{state} > th {
-      background-color: @background;
+  .table {
+    > thead,
+    > tbody,
+    > tfoot {
+      > tr > .@{state},
+      > .@{state} > td,
+      > .@{state} > th {
+        background-color: @background;
+      }
     }
   }
 
   // Hover states for `.table-hover`
   // Note: this is not available for cells or rows within `thead` or `tfoot`.
-  .table-hover > tbody > tr {
-    > td.@{state}:hover,
-    > th.@{state}:hover,
-    &.@{state}:hover > td,
-    &.@{state}:hover > th {
+  .table-hover > tbody {
+    > tr > .@{state}:hover,
+    > .@{state}:hover > td,
+    > .@{state}:hover > th {
       background-color: darken(@background, 5%);
     }
   }

less/tables.less

@@ -152,25 +152,11 @@ table {
 // Exact selectors below required to override `.table-striped` and prevent
 // inheritance to nested tables.
 
-.table {
-  > thead,
-  > tbody,
-  > tfoot {
-    > tr {
-      > td.active,
-      > th.active,
-      &.active > td,
-      &.active > th  {
-        background-color: @table-bg-active;
-      }
-    }
-  }
-}
-
 // Generate the contextual variants
-.table-row-variant(success; @state-success-bg; @state-success-border);
-.table-row-variant(danger; @state-danger-bg; @state-danger-border);
-.table-row-variant(warning; @state-warning-bg; @state-warning-border);
+.table-row-variant(active; @table-bg-active);
+.table-row-variant(success; @state-success-bg);
+.table-row-variant(danger; @state-danger-bg);
+.table-row-variant(warning; @state-warning-bg);
 
 
 // Responsive tables