Comment 18 for bug 1698572

Thanks, V Stuart Foote!

Of cause, I mean only "eqn" text editing by external editor (no MathML and other parts of formula object). For example LO Math may check settings on start and run external editor, than LO Math generates all this MathML as in normal mode - the only difference - it takes text from file, not from textbox.

But! This feature is already particulary realized in iMath plugin. Problem that it's don't open formula objects without "%%ii" text inside.

Also: iMath and CompPad can update formula after text changing. May be they do it with LibreOffice Math. So, may be more simple way exists to edit formula object?
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Link to iMath:
https://sourceforge.net/projects/ooo-imath/
Discussion:
https://sourceforge.net/p/ooo-imath/feature-requests/75/
To see how it works:
1. Install https://sourceforge.net/projects/ooo-imath/files/Beta%20versions/iMath-2.3.1/iMath-2.3.1~beta2.oxt/download
1. Open Service -> Parameters... -> LibreOffice Writer -> iMath global settings
2. Write path it field "Editing" (if problems - try to use path without spaces, else you may try to write just editor file name and than change %PATH%)
3. Create formula with "Insert" button on panel, write a=10+20 for example
4. Press right mouse button on formula and select Edit iFormula -> External Editor
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Link to ComPad (not maintainted now)
https://sourceforge.net/projects/comppad/