reverting commit in order to create a new branch for this fix.

src/js/simplemde.js

@@ -999,35 +999,25 @@ function _toggleBlock(editor, type, start_chars, end_chars) {
 }
 
 function _cleanBlock(cm) {
-	if(/editor-preview-active/.test(cm.getWrapperElement().lastChild.className)) {
+	if(/editor-preview-active/.test(cm.getWrapperElement().lastChild.className))
 		return;
+
+	var startPoint = cm.getCursor("start");
+	var endPoint = cm.getCursor("end");
+	var text;
+
+	for(var line = startPoint.line; line <= endPoint.line; line++) {
+		text = cm.getLine(line);
+		text = text.replace(/^[ ]*([# ]+|\*|\-|[> ]+|[0-9]+(.|\)))[ ]*/, "");
+
+		cm.replaceRange(text, {
+			line: line,
+			ch: 0
+		}, {
+			line: line,
+			ch: 99999999999999
+		});
 	}
-	// split the selection in lines
-	var selections = cm.getSelection().split("\n");
-	var removeTags = function(selection) {
-		var html = marked(selection);
-		// create a div...
-		var tmp = document.createElement("DIV");
-		// .. with the new generated html code...
-		tmp.innerHTML = html;
-		// ... now read the text of the generated code.
-		// This way the browser does the job of removing the tags.
-		var result = selection;
-		if(tmp.textContent) {
-			result = tmp.textContent;
-		} else if(tmp.innerText) {
-			result = tmp.innerText;
-		}
-		// removing trailing "new line"
-		return result.split("\n").join("");
-	};
-	var result = [];
-	for(var i = 0; i < selections.length; i++) {
-		result.push(removeTags(selections[i]));
-	}
-	// Add removed "new lines" back to the resulting string.
-	// Replace the selection with the new clean selection.
-	cm.replaceSelection(result.join("\n"));
 }
 
 // Merge the properties of one object into another.