in msword the hard-break between image and caption has a width

while for us it doesn't, make it invisible to give it zero width
in both implementations to head off interoperability misery

Change-Id: I0944006817944b20ef35502c8588357e7ee54810
diff --git a/sw/source/core/frmedt/fews.cxx b/sw/source/core/frmedt/fews.cxx
index 9d206c1..58d0c90 100644
--- a/sw/source/core/frmedt/fews.cxx
+++ b/sw/source/core/frmedt/fews.cxx
@@ -19,6 +19,7 @@

#include <svx/svdobj.hxx>
#include <comphelper/lok.hxx>
#include <editeng/charhiddenitem.hxx>
#include <init.hxx>
#include <fesh.hxx>
#include <pagefrm.hxx>
@@ -502,8 +503,15 @@ void SwFEShell::InsertLabel( const SwLabelType eType, const OUString &rText, con
                }
                //put a hard-break after the graphic to keep it separated
                //from the caption text if the outer frame is resized
                SwIndex aIdx(pTextNode, bBefore ? nInsertPos : 1);
                const sal_Int32 nIndex = bBefore ? nInsertPos : 1;
                SwIndex aIdx(pTextNode, nIndex);
                pTextNode->InsertText("\n", aIdx);
                //set the hard-break to be hidden, otherwise it has
                //non-zero width in word and so hard-break flows on
                //the next line, pushing the caption text out of
                //the frame making the caption apparently disappear
                SvxCharHiddenItem aHidden(true, RES_CHRATR_HIDDEN);
                pTextNode->InsertItem(aHidden, nIndex, nIndex + 1);
            }
        }