Make columns in split view of the same width (#3619)

as well as fix indentation and add 1px border to line counter of the new
code on the right.

public/less/_repository.less

@@ -989,13 +989,16 @@
                 margin: 0;
             }
             .lines-num {
-                border-right: 1px solid #d4d4d5;
+                border-color: #d4d4d5;
+                border-right-width: 1px;
+                border-right-style: solid;
                 padding: 0 5px;
             }
             tbody {
                 tr {
                     td.halfwidth {
-                        width: 50%;
+                        // halfwidth is used in split view - and in that case, 1% of each
+                        width: 49%;
                     }
 
                     &.tag-code td, td.tag-code {
@@ -1034,7 +1037,11 @@
                 border-color: #c1e9c1 !important;
             }
         }
-        .code-diff-split tbody tr {
+        .code-diff-split {
+            table, tbody {
+                width: 100%;
+            }
+            tbody tr {
                 // light gray for empty lines before / after commit
                 &.add-code td:nth-child(1), &.add-code td:nth-child(2),
                 &.del-code td:nth-child(3), &.del-code td:nth-child(4) {
@@ -1052,6 +1059,12 @@
                     background-color: #d6fcd6 !important;
                     border-color: #c1e9c1 !important;
                 }
+
+                td:nth-child(3) {
+                    border-left-width: 1px;
+                    border-left-style: solid;
+                }
+            }
         }
         &.file-content {
             img {