The Text property of the editor converts the html into plain text. Very handy. It would be really helpful if this could be exposed as a static method on the editor for use elsewhere, without having to create an editor object.

 I know that I could just grab the source code and create my own, but then I don't get the benefit of improvements and bug fixes you may add in the future.

ColorPicker inside a RadEditor don't fit inside DropDownBody, the last color jumps down a row. This happens when RadEditor Skin is set MetroTouch and RenderMode to Lightweight.
Video: http://screencast.com/t/4GOnnf0UcsfU

It becomes the operation of Chrome only.

after the new line, if you type continuously double-byte character string "あい",the input result was "い".
The correct answer is "あい".

For operation that does not occur in earlier versions, I think I've considered this release version of the bug, the cause can be identified?

The issue is reproducible when NewLineMode is Br and the cursor is at the end of the formatting node in Chrome. 

The workaround is to check the position of the new inserted Br element and append it to the formatting node if it is necessary.

<telerik:RadEditor ID="RadEditor1" runat="server" NewLineMode="Br">
</telerik:RadEditor>

<script type="text/javascript">
	(function () {
		if (!$telerik.isChrome)
			return;
		var insertBr = Telerik.Web.UI.Editor.EnterNewLineCommand.prototype._insertBrElementSafari;
		Telerik.Web.UI.Editor.EnterNewLineCommand.prototype._insertBrElementSafari = function () {
			var utils = Telerik.Web.UI.Editor.Utils,
				command = this,
				selection = command.get_editor().getSelection(),
				range = selection.getRange();

			if (range.commonAncestorContainer != range.startContainer || range.commonAncestorContainer != range.endContainer)
				return insertBr.call(command);

			var commonElement = utils.isTextNode(range.commonAncestorContainer) ?
				range.commonAncestorContainer.parentNode : range.commonAncestorContainer;

			var commandResult = insertBr.call(command);
			range = selection.getRange();
			var br = range.commonAncestorContainer.childNodes[range.startOffset];

			if (!utils.isTag(br, "br"))
				return commandResult;

			if (!$telerik.$.contains(commonElement, br)) {
				commonElement.appendChild(br);
				range.selectNodeContents(commonElement);
				range.collapse(false);
				selection.selectRange(range);
			}

			return commandResult;
		}
	})();
</script>

When a groupbox is inserted and start typing text, the fieldset stays fixed in size.

You can use the following resolved command:

<telerik:RadEditor runat="server" ID="RadEditor1">
</telerik:RadEditor>

<script type="text/javascript">
	Telerik.Web.UI.Editor.CommandList.InsertGroupbox = function myfunction(commandName, editor, args) {
		var localizedTitle = editor.getLocalizedString("RadEditorGroupboxTitle", "Title");
		var localizedContent = editor.getLocalizedString("RadEditorGroupboxContent", "Content...");
		value = "<fieldset style='width: 200px; min-height: 76px'> <legend>" + localizedTitle + "</legend>" + localizedContent + " </fieldset> ";

		editor.pasteHtml(value, commandName);
	}
</script>

Setting escaped symbols in the text nodes of the content breaks cursor navigation and word deleting.

This is due to IE10 and less browser versions native behavior to interact with escaped symbols as normal ones. 

A possible resolutions is implementing a filter that strips the undesired characters and disable the IndentHTMLContent:

ASP.NET
________________________________________________________________________________
<telerik:RadEditor ID="radEditMain" runat="server"
     EnableTrackChanges="true"
    OnClientLoad="OnClientLoad">
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientLoad(editor, args) {
        editor.get_filtersManager().add(new MyFilter());

        var cleanHtml = editor.get_html(true);
        editor.set_html(cleanHtml);
    }

    MyFilter = function () {
        MyFilter.initializeBase(this);
        this.set_isDom(false);
        this.set_enabled(true);
        this.set_name("MyFilter");
        this.set_description("RadEditor filter description");
    }

    MyFilter.prototype = {
        getHtmlContent: function (content) {
            var newContent = content;
            //Make changes to the content and return it
            newContent = newContent.replace(/(\r\n|\n|\r)/gm, " ");
            newContent = newContent.replace(/(\t)/gm, " ");
            return newContent;
        }
    }
    MyFilter.registerClass('MyFilter', Telerik.Web.UI.Editor.Filter);
</script>
________________________________________________________________________________


C#
________________________________________________________________________________
protected void Page_Load(object sender, EventArgs e)
{
	radEditMain.DisableFilter(EditorFilters.IndentHTMLContent);
}
________________________________________________________________________________

When the HTML content is set with nested list elements and an empty paragraph right after the primary list, deleting this empty paragraph will cause the nested list to go outside the list item.

This matter causes an incorrect HTML markup and additionally causes incorrect tool behavior.

Passing trough Design to HTML cures the issue (invoking the content filters) cures the issue, although there are cases where users cannot be prompted to do that.

Using native events to resolve the backspace behavior:

<telerik:RadEditor ID="RadEditor1" runat="server" OnClientLoad="OnClientLoad">
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientLoad(editor, args) {
        editor.attachEventHandler("onkeydown", function (e) {
            if (e.keyCode == 8 && $telerik.isIE10Mode && !$telerik.isIE10) {
                var selElm = editor.getSelectedElement();
                var isCursorInFront = editor.getSelection().getRange().startOffset == 0;
                if (selElm && selElm.nodeName == "P" && isCursorInFront) {
                    editor.attachEventHandler("onkeyup", fixContent);
                }
            }
        });

        var fixContent = function () {
            editor.set_html(editor.get_html(true));
            editor.detachEventHandler("onkeyup", fixContent);
        }
    }
</script>

RadEditor strips urls pointing to the current page when MakeUrlsAbsolute is enabled.

Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/editor/examples/builtincontentfilters/defaultcs.aspx

2. Clear the content of the Editor, swith to html mode and paste the following content:
test
<a href="http://demos.telerik.com/aspnet-ajax/editor/examples/builtincontentfilters/defaultcs.aspx" target="_self">2.2.2</a>
<br>
<table bordercolor="#000000" border="1" cellspacing="0" cellpadding="2">
    <tbody>
        <tr>
            <td style="text-align: center; vertical-align: middle;" rowspan="2"><strong>Text</strong></td>
        </tr>
    </tbody>
</table>


3. Switch to Design mode and back to html mode.

Result: The content will be stripped like follows:
test
<a href="#000000" border="1" cellspacing="0" cellpadding="2">
     
         
            <strong>Text</strong>
         
     
</a>

If a list with some non-default formatting in the bullet points is pasted, the custom formatting is not applied.

For example, changing the font-size of a bullet point in MS Word list, will be pasted only with relevant formatting in the text node, but will leave the <li> elements stripped out.

It would be nice if there is additional logic to apply the proper formatting in the bullet points accordingly to the one copied from MS Word.

I've had some complaints from user on a page with 2 RadEditors.  If they go to a 2nd page and then hit the 'back' button, all the other controls on the page have what they last typed in, but not the 2 radEditors.

If you setup multiple RadEditor controls on a single page with RenderMode set to Lightweight then when you change the foreground or background colour on one control, the other controls update their toolbar at the same time.

Sample Page code

When the fore/backcolor of the Editor is changed through its toolbar, the same color is set to all Editors on the page. The problem is reproducible in Lightweight rendering.

Video: https://www.screencast.com/t/YQ4OnNmu

Content font famility is changed when a word is spell checked in Chrome in Windows 7.

Video: https://www.screencast.com/t/Y358IWoWz

Steps to reproduce:

Paste the following content in this demo: http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx

<span id="ctl10_supportMessagesRepeaterControl_repeaterMessages_ctl11_lblMessageText" class="text"><span style="font-family: Arial; font-size: small; background-color: #ffffff;">Dear Telerik&nbsp;</span><br style="font-family: Arial; font-size: small; background-color: #ffffff;" />
<br style="font-family: Arial; font-size: small; background-color: #ffffff;" />
<strong>Notice: Issue: 2016: WestenBook Help and Test<br />
Please check it 20170828 &nbsp;</strong><span style="font-family: Arial; font-size: small; background-color: #ffffff;"></span></span>

The content is not scrolled to the end of the pasted content in IE11 - the scrollbar keeps its initial position instead. The issue is reproducible in IE (tested in IE11) and Chrome, but not in Firefox nor standard editable iframe.

Steps to reproduce:
1. Open in IE: http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Paste big enough content, so the scrollbar will be shown

Actual: The scrollbar stays on the top.
Expected: The content area is scrolled to the end of the pasted content

Possible workaround could be creating a temporary selectable element after the pasted content, which to be selected manually:
		<telerik:RadEditor ID="txtMessage"  runat="server" OnClientPasteHtml="OnClientPasteHtml">
		</telerik:RadEditor>
		<script>
			function OnClientPasteHtml(editor, args) {
				if (args.get_commandName() == "Paste" && $telerik.isIE) {
					args.set_value(args.get_value() + "<div id='selectableEl'></div>");
					setTimeout(function () {
						var selectedEl = editor.get_document().getElementById("selectableEl");
						console.log(editor.getSelectedElement());
						Telerik.Web.UI.Editor.Utils.scrollTo(selectedEl, editor);
						$telerik.$(selectedEl).remove();
					}, 0);
				}
			}
		</script>