[LyX/2.3-staging] Avoid narrow boxes when using \width as box width unit

[Jean-Marc Lasgouttes]

commit 5ac9a40182470eb8fe508bf8c6432badf5919c72
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Tue Apr 5 10:43:16 2016 +0200

    Avoid narrow boxes when using \width as box width unit
    
    When the box has a special width, one should not consider that as a fixed 
width. Otherwise, due to implementation quirks, the width will be set on screen 
as 1 inch.
    
    A better solution would be to actually set the width by taking in account 
the contents width, height ans total height. This is not very difficult, but I 
do not know whether it would workout well in the work area.
    
    Fixes bug #10048.

diff --git a/src/insets/InsetBox.cpp b/src/insets/InsetBox.cpp
index eee16fe..ea18afa 100644
--- a/src/insets/InsetBox.cpp
+++ b/src/insets/InsetBox.cpp
@@ -169,7 +169,7 @@ void InsetBox::setButtonLabel()
 
 bool InsetBox::hasFixedWidth() const
 {
-       return !params_.width.empty();
+       return !params_.width.empty() && params_.special == "none";
 }