Fix bugs: preview/fullscreen with multiple editors on same page

source files/codemirror/fullscreen.js

@@ -27,7 +27,7 @@
 	wrap.style.height = "auto";
 	wrap.className += " CodeMirror-fullscreen";
 	document.documentElement.style.overflow = "hidden";
-	document.getElementsByClassName("editor-toolbar")[0].className += " fullscreen";
+	wrap.previousSibling.className += " fullscreen";
 	cm.refresh();
   }
 
@@ -38,7 +38,7 @@
 	var info = cm.state.fullScreenRestore;
 	wrap.style.width = info.width; wrap.style.height = info.height;
 	window.scrollTo(info.scrollLeft, info.scrollTop);
-	document.getElementsByClassName("editor-toolbar")[0].className = document.getElementsByClassName("editor-toolbar")[0].className.replace(/\s*fullscreen\b/, "");
+	wrap.previousSibling.className = wrap.previousSibling.className.replace(/\s*fullscreen\b/, "");
 	cm.refresh();
   }
 });

source files/simplemde.js

@@ -211,11 +211,11 @@ function redo(editor) {
  * Preview action.
  */
 function togglePreview(editor) {
-	var toolbar_div = document.getElementsByClassName('editor-toolbar')[0];
-	var toolbar = editor.toolbarElements.preview;
-	var parse = editor.constructor.markdown;
 	var cm = editor.codemirror;
 	var wrapper = cm.getWrapperElement();
+	var toolbar_div = wrapper.previousSibling;
+	var toolbar = editor.toolbarElements.preview;
+	var parse = editor.constructor.markdown;
 	var preview = wrapper.lastChild;
 	if (!/editor-preview/.test(preview.className)) {
 		preview = document.createElement('div');