Remove selectionToGFM

app/assets/javascripts/copy_as_gfm.js

@@ -343,13 +343,6 @@ class CopyAsGFM {
     return codeEl;
   }
 
-  static selectionToGFM(documentFragment, transformer) {
-    const el = transformer(documentFragment.cloneNode(true));
-    if (!el) return null;
-
-    return CopyAsGFM.nodeToGFM(el);
-  }
-
   static nodeToGFM(node) {
     if (node.nodeType === Node.COMMENT_NODE) {
       return '';

spec/features/copy_as_gfm_spec.rb

@@ -579,10 +579,15 @@ describe 'Copy as GFM', feature: true, js: true do
   def html_to_gfm(html, transformer = 'transformGFMSelection')
     js = <<-JS.strip_heredoc
       (function(html) {
+        var transformer = window.gl.CopyAsGFM[#{transformer.inspect}];
+
         var node = document.createElement('div');
         node.innerHTML = html;
-        var transformer = window.gl.CopyAsGFM[#{transformer.inspect}];
-        return window.gl.CopyAsGFM.selectionToGFM(node, transformer);
+
+        node = transformer(node);
+        if (!node) return null;
+
+        return window.gl.CopyAsGFM.nodeToGFM(node);
       })("#{escape_javascript(html)}")
     JS
     page.evaluate_script(js)