Fixes: Not possible to tell whether "Operate by instruction" is enabled

from Menu entry

Don't show the icon of checkable items in the menu to avoid being
affected by broken styles.

Task-number: QTCREATORBUG-1173

src/plugins/debugger/debuggeractions.cpp

@@ -227,6 +227,7 @@ DebuggerSettings *DebuggerSettings::instance()
         "operation mode. In this mode, stepping operates on single "
         "instructions and the source location view also shows the "
         "disassembled instructions."));
+    item->setIconVisibleInMenu(false);
     instance->insertItem(OperateByInstruction, item);
 
     item = new SavedAction(instance);

src/plugins/debugger/debuggermanager.cpp

@@ -557,6 +557,7 @@ void DebuggerManager::init()
     d->m_actions.reverseDirectionAction->setChecked(false);
     d->m_actions.reverseDirectionAction->setIcon(
         QIcon(":/debugger/images/debugger_reversemode_16.png"));
+    d->m_actions.reverseDirectionAction->setIconVisibleInMenu(false);
 
     connect(d->m_actions.continueAction, SIGNAL(triggered()),
         this, SLOT(executeContinue()));