[REG 3.3->master] Return value doesn't appear until stepping again

Pressing Shift-F11 used to show the return value in the L&E view.

Now it doesn't show anything, but when pressing F10/F11 again it is shown for a fraction of second and disappears.

The workflow of the attached log:

• Started when inside foo()
• Press Shift-F11
• Press F11 again -> The return value is shown and disappears.

int foo() { return 42; } // Shift-F11
int bar() { return 44; }

int main()
{
    int f = foo(); // F11
    int b = bar();
    return 0;
}