[LyX/master] Fix duplicate, disabled "Separated Frame Below"

[Scott Kostyshak]

commit 4f7a5f8c3e1bb633a9ee92cf692a116180537073
Author: Scott Kostyshak <skost...@lyx.org>
Date:   Fri Apr 27 23:01:01 2018 -0400

    Fix duplicate, disabled "Separated Frame Below"
    
    This commit fixes an issue where the menu option "Insert Separated
    Frame Below" would show up twice, with one instance disabled. This
    occurred when there was a "Standard" environment nested in a
    "Frame". With this commit, the duplicate instance is removed.
---
 src/frontends/qt4/Menus.cpp |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/frontends/qt4/Menus.cpp b/src/frontends/qt4/Menus.cpp
index 662ea66..c68ecbe 100644
--- a/src/frontends/qt4/Menus.cpp
+++ b/src/frontends/qt4/Menus.cpp
@@ -1917,9 +1917,10 @@ void 
MenuDefinition::expandEnvironmentSeparators(BufferView const * bv,
                                translateIfPossible(prevlayout));
                // We use command-alternatives here since this is how the 
binding is defined
                // (otherwise, the binding is not displayed in the menu)
-               add(MenuItem(MenuItem::Command, toqstr(label),
-                            FuncRequest(LFUN_COMMAND_ALTERNATIVES,
-                                        from_ascii("environment-split ; 
environment-split previous"))));
+               if (getStatus(FuncRequest(LFUN_ENVIRONMENT_SPLIT)).enabled())
+                       add(MenuItem(MenuItem::Command, toqstr(label),
+                                    FuncRequest(LFUN_COMMAND_ALTERNATIVES,
+                                                from_ascii("environment-split 
; environment-split previous"))));
        }
        if (!outerlayout.empty()) {
                docstring label;