[LyX/2.2.x] Fix bug #10195

[Guillaume Munch]

commit 41f7f1d237c5f0ffa05c9ef52e21bab671ae57dd
Author: Guillaume Munch <g...@lyx.org>
Date:   Tue Jun 14 00:17:38 2016 +0100

    Fix bug #10195
    
    The computation of the index of the main text entry of a row did not take 
into
    account the fact that the entry could be optimised away.
    
    (cherry picked from commit 947c34364c7f6a5c12ddfa7286ff504c62a1038a)

diff --git a/src/TexRow.cpp b/src/TexRow.cpp
index 8586a81..400daf3 100644
--- a/src/TexRow.cpp
+++ b/src/TexRow.cpp
@@ -35,8 +35,11 @@ bool TexRow::RowEntryList::addEntry(RowEntry const & entry)
        if (!entry.is_math) {
                if (text_entry_ < size())
                        return false;
-               else
+               else {
                        text_entry_ = size();
+                       push_back(entry);
+                       return true;
+               }
        }
        forceAddEntry(entry);
        return true;