ThemeManager's OnThemeChanged work-around conflicting with other WPF internals.

[remcoros]

I found a conflict with ThemeManager and SharedSizeGroup (or rendering in general).

See this SO question for more details: http://stackoverflow.com/questions/21061630/wpf-listbox-selecteditem-changing-twice-bug/21061804?noredirect=1#comment31671940_21061804

It seems this work-around is conflicting with other rendering procedures in WPF:

    /// <summary>
    /// Invalidates global colors and resources.
    /// Sometimes the ContextMenu is not changing the colors, so this will fix it.
    /// </summary>

I disabled this method in a custom build and my issue (on SO) goes away.

Obviously disabling this work-around is not a real fix.

Hopefully anyone with more experience of WPF internals can take a look.

[remcoros]

I also noticed that without these internal calls. The theme/accent change is almost instant. Where as with OnThemeChanged enabled there is a small delay / freeze of the application when changing the theme.

[flagbug]

Hm, this may also be the reason why MediaElement resets itself when changing the accent

[remcoros]

with the work-around disabled, I now see old accent colors. obviously. I hope someone can come up with a solution.

[AzureKitsune]

Perhaps @punker76 can chime in on this.

[remcoros]

I did some trial and error on this.

Disabling line 285, fixes my issue with the ListBox (and probably also with mentioned MediaElement), while still refreshing the accent colors:

        var invalidateParameters = typeof(SystemParameters).GetMethod("InvalidateCache", BindingFlags.Static | BindingFlags.NonPublic, null, Type.EmptyTypes, null);
        if (invalidateParameters != null)
        {
            // invalidateParameters.Invoke(null, null);
        }

This solved everything for me.

Please verify.