[LyX/2.3.x] Fix #6344.

[Richard Heck]

commit 0662ffb98e136c5997fab7354e203044ac76974f
Author: Richard Heck <rgh...@lyx.org>
Date:   Sat Jun 25 01:39:59 2016 -0400

    Fix #6344.
    
    For some reason, special code was added for LFUN_INDEX_INSERT
    when it was not actually needed. So just delete it.
    
    (cherry picked from commit 83356ab9fed1b6ab24d129486ab8e3c7dfd6ea4a)
---
 src/Text3.cpp |   15 +--------------
 status.23x    |    2 ++
 2 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/src/Text3.cpp b/src/Text3.cpp
index e0358fc..9d75274 100644
--- a/src/Text3.cpp
+++ b/src/Text3.cpp
@@ -249,20 +249,7 @@ static bool doInsertInset(Cursor & cur, Text * text,
                ci->setButtonLabel();
 
        cur.recordUndo();
-       if (cmd.action() == LFUN_INDEX_INSERT) {
-               docstring ds = subst(text->getStringToIndex(cur), '\n', ' ');
-               text->insertInset(cur, inset);
-               if (edit)
-                       inset->edit(cur, true);
-               // Now put this into inset
-               Font const f(inherit_font, cur.current_font.language());
-               if (!ds.empty()) {
-                       cur.text()->insertStringAsLines(cur, ds, f);
-                       cur.leaveInset(*inset);
-               }
-               return true;
-       }
-       else if (cmd.action() == LFUN_ARGUMENT_INSERT) {
+       if (cmd.action() == LFUN_ARGUMENT_INSERT) {
                bool cotextinsert = false;
                InsetArgument const * const ia = static_cast<InsetArgument 
const *>(inset);
                Layout const & lay = cur.paragraph().layout();
diff --git a/status.23x b/status.23x
index fbd0357..970f234 100644
--- a/status.23x
+++ b/status.23x
@@ -212,6 +212,8 @@ What's new
 
 - Fix weird bug with counters when reloading with emergency file.
 
+- Handle math insets properly when inserting index entries (bug 6344).
+
 
 * INTERNALS