[LyX/master] Add missing transition to button controller

[Juergen Spitzmueller]

commit 164e8d1dc80ddd2017479ed4db701d76c133c22d
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat May 5 11:32:56 2018 +0200

    Add missing transition to button controller
    
    (needed by GuiCharacter, the only user of that specific policy)
---
 src/frontends/qt4/ButtonPolicy.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/frontends/qt4/ButtonPolicy.cpp 
b/src/frontends/qt4/ButtonPolicy.cpp
index 1866a3c..5426271 100644
--- a/src/frontends/qt4/ButtonPolicy.cpp
+++ b/src/frontends/qt4/ButtonPolicy.cpp
@@ -595,6 +595,7 @@ void ButtonPolicy::Private::initOkApplyCancelAutoReadOnly()
        state_machine_[INVALID][SMI_INVALID] = INVALID;
        state_machine_[INVALID][SMI_READ_WRITE] = INVALID;
        state_machine_[INVALID][SMI_VALID] = VALID;
+       state_machine_[INVALID][SMI_OKAY] = INITIAL;
        state_machine_[INVALID][SMI_RESTORE] = INITIAL;
        state_machine_[INVALID][SMI_READ_ONLY] = RO_INVALID;
        state_machine_[INVALID][SMI_AUTOAPPLY] = AUTOAPPLY_CHANGED;