Fix bug #6581: Empty base of a script inset should not be shown as an empty brace inset on screen

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@33772 a592a061-630c-0410-9148-cb99ea01b6c8

src/mathed/MathParser.cpp

@@ -934,6 +934,14 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 			// in an unreliable way. See this thread
 			// http://www.mail-archive.com/lyx-devel%40lists.lyx.org/msg104917.html
 			// for more details.
+			// However, we remove empty braces because they look
+			// ugly on screen and we are sure that they were added
+			// by the write() method (and will be re-added on save).
+			if (p->nuc().size() == 1 &&
+			    p->nuc().back()->asBraceInset() &&
+			    p->nuc().back()->asBraceInset()->cell(0).empty())
+				p->nuc().erase(0);
+
 			parse(p->cell(p->idxOfScript(up)), FLAG_ITEM, mode);
 			if (limits) {
 				p->limits(limits);

status.16x

@@ -56,6 +56,9 @@ What's new
 - <Enter> in empty enumerations and other environments decreases depth if
   possible and otherwise resets the layout to standard.
 
+- Don't show the empty base of a script inset as an empty brace inset
+  on screen (bug 6581).
+
 
 * DOCUMENTATION AND LOCALIZATION