Merge branch 'repo-editor-ui-fix' into 'master'

Several repo editor fixes

Closes #36128, #36240, and #37733

See merge request !14126

app/assets/stylesheets/pages/repo.scss

@@ -71,6 +71,11 @@
     height: 100%;
 
     .monaco-editor.vs {
+      .current-line {
+        border: none;
+        background: $well-light-border;
+      }
+
       .line-numbers {
         cursor: pointer;
 
@@ -84,6 +89,13 @@
       }
     }
 
+    .blob-no-preview {
+      .vertical-center {
+        justify-content: center;
+        width: 100%;
+      }
+    }
+
     &.edit-mode {
       .blob-viewer-container {
         overflow: hidden;
@@ -103,7 +115,7 @@
       overflow: auto;
 
       > div,
-      .file-content {
+      .file-content:not(.wiki) {
         display: flex;
       }
 

app/views/projects/blob/viewers/_download.html.haml

 .file-content.blob_file.blob-no-preview
-  .center
+  .center.render-error.vertical-center
     = link_to blob_raw_path do
       %h1.light
         = icon('download')