Fixes #6538: Add th support to all the .table-rounded selectors

docs/assets/css/bootstrap.css

@@ -2053,14 +2053,16 @@ table {
 }
 
 .table-bordered thead:first-child tr:first-child > th:first-child,
-.table-bordered tbody:first-child tr:first-child > td:first-child {
+.table-bordered tbody:first-child tr:first-child > td:first-child,
+.table-bordered tbody:first-child tr:first-child > th:first-child {
   -webkit-border-top-left-radius: 4px;
           border-top-left-radius: 4px;
   -moz-border-radius-topleft: 4px;
 }
 
 .table-bordered thead:first-child tr:first-child > th:last-child,
-.table-bordered tbody:first-child tr:first-child > td:last-child {
+.table-bordered tbody:first-child tr:first-child > td:last-child,
+.table-bordered tbody:first-child tr:first-child > th:last-child {
   -webkit-border-top-right-radius: 4px;
           border-top-right-radius: 4px;
   -moz-border-radius-topright: 4px;
@@ -2068,7 +2070,9 @@ table {
 
 .table-bordered thead:last-child tr:last-child > th:first-child,
 .table-bordered tbody:last-child tr:last-child > td:first-child,
-.table-bordered tfoot:last-child tr:last-child > td:first-child {
+.table-bordered tbody:last-child tr:last-child > th:first-child,
+.table-bordered tfoot:last-child tr:last-child > td:first-child,
+.table-bordered tfoot:last-child tr:last-child > th:first-child {
   -webkit-border-bottom-left-radius: 4px;
           border-bottom-left-radius: 4px;
   -moz-border-radius-bottomleft: 4px;
@@ -2076,7 +2080,9 @@ table {
 
 .table-bordered thead:last-child tr:last-child > th:last-child,
 .table-bordered tbody:last-child tr:last-child > td:last-child,
-.table-bordered tfoot:last-child tr:last-child > td:last-child {
+.table-bordered tbody:last-child tr:last-child > th:last-child,
+.table-bordered tfoot:last-child tr:last-child > td:last-child,
+.table-bordered tfoot:last-child tr:last-child > th:last-child {
   -webkit-border-bottom-right-radius: 4px;
           border-bottom-right-radius: 4px;
   -moz-border-radius-bottomright: 4px;

less/tables.less

@@ -93,24 +93,32 @@ table {
   tbody:first-child tr:first-child td {
     border-top: 0;
   }
-  // For first th or td in the first row in the first thead or tbody
+  // For first th/td in the first row in the first thead or tbody
   thead:first-child tr:first-child > th:first-child,
-  tbody:first-child tr:first-child > td:first-child {
+  tbody:first-child tr:first-child > td:first-child,
+  tbody:first-child tr:first-child > th:first-child {
     .border-top-left-radius(@baseBorderRadius);
   }
+  // For last th/td in the first row in the first thead or tbody
   thead:first-child tr:first-child > th:last-child,
-  tbody:first-child tr:first-child > td:last-child {
+  tbody:first-child tr:first-child > td:last-child,
+  tbody:first-child tr:first-child > th:last-child {
     .border-top-right-radius(@baseBorderRadius);
   }
-  // For first th or td in the last row in the last thead or tbody
+  // For first th/td (can be either) in the last row in the last thead, tbody, and tfoot
   thead:last-child tr:last-child > th:first-child,
   tbody:last-child tr:last-child > td:first-child,
-  tfoot:last-child tr:last-child > td:first-child {
+  tbody:last-child tr:last-child > th:first-child,
+  tfoot:last-child tr:last-child > td:first-child,
+  tfoot:last-child tr:last-child > th:first-child {
     .border-bottom-left-radius(@baseBorderRadius);
   }
+  // For last th/td (can be either) in the last row in the last thead, tbody, and tfoot
   thead:last-child tr:last-child > th:last-child,
   tbody:last-child tr:last-child > td:last-child,
-  tfoot:last-child tr:last-child > td:last-child {
+  tbody:last-child tr:last-child > th:last-child,
+  tfoot:last-child tr:last-child > td:last-child,
+  tfoot:last-child tr:last-child > th:last-child {
     .border-bottom-right-radius(@baseBorderRadius);
   }