How to Preserve <pre> tag Line Break Formatting in TinyMCE

Why are <pre> tags not preserving line break formatting in TinyMCE?
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I recently discovered an issue after I upgraded to TinyMCE 4.1.3 version text editor in my ASP.NET web pages that was causing the formatting of my <pre> tags to not keep its line break formating on PostBack.  At first I thought this might be a CSS issue or an HtmlEncoding issue however that wasn't the case for me.  

Before upgrading, I was previously running TinyMCE 3.xxx using the ASP.NET server control.  After upgrading to version 4.1.3, I need to make changes to TextBoxes on my ASP.NET pages.  What I came to realize is that when upgrading to the new version, I had left off my ASP.NET TextBoxes the following declaration: TextMode="Multiline". So the <pre> line break problem was caused because I had attached TinyMCE to TextBoxes in the default "SingleLine" mode, causing the <pre> tag to not preserve line breaks after posting back.  Once I added TextMode="Multiline" to the TextBoxes, the <pre> tag preserved its formatting and looked correct after postback and on pages. 

If you are not using ASP.NET, then be sure to use <textarea> with TinyMCE, instead of <input type="text">.  After some testing, here's what worked for me and what DID NOT work to get <pre> tags to preserve line break formatting with TinyMCE text editor in ASP.NET pages:

    <div>
        <!-- PRE line breaks work correctly with TinyMCE text editor -->
        <asp:TextBox ID="tbxTinymce" runat="server" CssClass="my-tinymce-default" TextMode="MultiLine"></asp:TextBox>  
        <!-- PRE line breaks work correctly with TinyMCE text editor  -->
        <textarea name="textarea" class="my-tinymce-default" ></textarea>

        <!-- PRE line breaks DO NOT preserve line break formatting -->
        <input id="Text1" type="text" class="my-tinymce-default"  />
        <!-- PRE line breaks DO NOT preserve line break formatting -->
        <asp:TextBox ID="TextBox1" runat="server" CssClass="my-tinymce-default"></asp:TextBox> 

    </div>

Also here's the <pre> tag CSS that I am currently using that helps with formatting line breaks in <pre> tags:

pre {
    overflow: auto;
    white-space: pre-wrap; /* CSS3 browsers  */ /* make code wrap */               
    white-space: -moz-pre-wrap !important; /* 1999+ Mozilla  */
    white-space: -pre-wrap;                /* Opera 4 thru 6 */
    white-space: -o-pre-wrap;              /* Opera 7 and up */
    word-wrap: normal;                 /* IE 5.5+ and up */
	font-family: Consolas,Menlo,Monaco,Lucida Console,Liberation Mono,DejaVu Sans Mono,Bitstream Vera Sans Mono,Courier New,monospace,serif;
    border: 1px solid #CCCCCC;
    background-color: #f0f9ff ; /*#EEEEEE  #FFFFF4;*/
    padding: 8px;
    margin-bottom: 10px;
    border-radius: 0px;
}

 

 

 

 


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