Setting "Smooth Transitions" for popup menu's

The setting "Smooth Transitions" to enable or disable smooth transitions
with fade-out and fade-in when switching between menu pages is now extended
to enable or disable the popup menu animations.
The popup menu's typically have a fade-out and fade-in time of 100ms.
However, this can take sometimes much more time, for example on low-powered
ARM machines but also when using NVIDIA cards with the nouveau drvier.
See also commit 09f0865 where the
setting "Smooth Transitions" is introduced.

mythtv/libs/libmythui/mythuianimation.cpp

@@ -1,6 +1,7 @@
 #include "mythuianimation.h"
 #include "mythuitype.h"
 #include "mythmainwindow.h"
+#include "libmythbase/mythcorecontext.h"
 
 #include <QDomDocument>
 
@@ -48,7 +49,8 @@ QRect UIEffects::GetExtent(const QSize size) const
 
 void MythUIAnimation::Activate(void)
 {
-    m_active = true;
+    if (GetMythDB()->GetBoolSetting("SmoothTransitions", true))
+        m_active = true;
     setCurrentTime(0);
 }
 

mythtv/programs/mythfrontend/globalsettings.cpp

@@ -2630,8 +2630,8 @@ static HostCheckBoxSetting *SmoothTransitions()
 
     gc->setValue(true);
 
-    gc->setHelpText(AppearanceSettings::tr("Enable smooth transitions with fade-in and fade-out of menu pages. "
-                                           "Disabling this can make the GUI respond faster."));
+    gc->setHelpText(AppearanceSettings::tr("Enable smooth transitions with fade-in and fade-out of menu pages and enable GUI animations. "
+                                           "Disabling this can make the GUI respond faster especially on low-powered machines."));
     return gc;
 }