[PATCH] Support \\*

[Chris Spiegel]

I'm attaching two patches, one against git master, the other against
the 2.3.x branch. These patches add a starred new line break
formatting option (\\*) to complement "Ragged line break", i.e. the \\
macro.

My specific use case for this is for short stanzas in a verse
environment: \\* will prevent a page break in the middle of a stanza.

For lack of a better term I've called this "Starred line break" though
I'm sure it can be renamed to something more appropriate.  I've also
given it the keyboard shortcut of meta-shift-enter, which is in the
ballpark of the other newline-style formatting options.

I've been using this patch at least since the LyX 1.6.0 days, with no problems.

Whether this is the best way to support \\* I'm not sure, but I do
think having the ability to add \\* directly, rather than via ERT, is
very useful.

-- 
Chris Spiegel
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