[LyX/2.1.x] Increase TOC_ENTRY_LENGTH (#9579)

[Guillaume Munch]

commit b0563583620faaec7c27c21625748b6085611536
Author: Guillaume Munch <g...@lyx.org>
Date:   Fri Oct 2 19:48:59 2015 +0100

    Increase TOC_ENTRY_LENGTH (#9579)

diff --git a/src/insets/Inset.h b/src/insets/Inset.h
index a5dc7cd..b92df2d 100644
--- a/src/insets/Inset.h
+++ b/src/insets/Inset.h
@@ -74,7 +74,7 @@ std::string insetName(InsetCode);
 /// Eg, insetDisplayName(BRANCH_CODE) == _("Branch")
 docstring insetDisplayName(InsetCode);
 ///
-static int const TOC_ENTRY_LENGTH = 40;
+static int const TOC_ENTRY_LENGTH = 128;
 
 /// Common base class to all insets