https://bugs.documentfoundation.org/show_bug.cgi?id=104211

            Bug ID: 104211
           Summary: Fails to save previous state for undo when I `Import
                    MathML from clipboard`
           Product: LibreOffice
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Formula Editor
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: m...@stengle.in

Description:
In Writer, while editing a formula, if you use the `Import MathML from
clipboard` function, it clears the entire contents of the formula and does not
allow you to undo any wrong usage of this function.

In my particular case, I was trying to get a specific element that I didn't
know the exact syntax for in LibreOffice's syntax, so I copied the specific
language in MathML, and it wiped the entire contents of the formula. It's a bit
annoying to have to retype it all.

I am running the latest version, and have not tested to see if it also does
this in other builds.

Steps to Reproduce:
1.Insert>Object>Formula
2.Type in something to show in the formula on screen.
3.Copy some xml-ish text into your clipboard `<test>Test</test>` should do
nicely.
4.Tools>Import MathML from Clipboard

Actual Results:  
As described, it clears the entire formula and does not let you use the `undo`
feature to get anything back.

Expected Results:
I would expect to be able to undo this operation and get my formula back.


Reproducible: Always

User Profile Reset: No

Additional Info:
Technically this causes you to lose data (the last few minutes of typing into
the formula) but I wouldn't really consider this anywhere near Critical. So
normal it is, it should be fixed.


User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0) Gecko/20100101
Firefox/50.0

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