Add palette() and further hints to QtGui/QPlatformTheme.

- Move palette() from deprecated QtWidgets/QGuiPlatformPlugin
  to  QtGui/QPlatformTheme, Make it return a const * since
  QPalette does not have isNull().
- Initialize QGuiApplication::palette() and
  QApplication::systemPalette() from it.
- Do not initialize QPalette from QGuiApplication::palette()
  unless app_pal is non-null (default to Qt::black if it is 0).
  This avoids initialization order crashes/recursions in the
  QPA plugin. Streamline initialization function.
- Remove styleName(), systemIconThemeName() and iconSearchPaths()
  from QGuiPlatformPlugin and re-add them as
  QPlatformTheme::themeHint().
- Remove styleHint() from QGuiPlatformPlugin, add it to
  QPlatformTheme::themeHint().
- Add UNIX themes with factory function (Generic,
  KDE, Gnome), taking it from Qt 4.8 code (stripping the
  KDE 3 code).
- Implement Windows palettes.

Task-number: QTBUG-24204

Change-Id: Ie27ec035df4f84c42deaffc4816b2e53ce705462
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowsguieventdispatcher.cpp b/src/plugins/platforms/windows/qwindowsguieventdispatcher.cpp
index 34ab1665d8..49158dce48 100644
--- a/src/plugins/platforms/windows/qwindowsguieventdispatcher.cpp
+++ b/src/plugins/platforms/windows/qwindowsguieventdispatcher.cpp
@@ -203,7 +203,8 @@ messageDebugEntries[] = {
     {WM_IME_ENDCOMPOSITION, "WM_IME_ENDCOMPOSITION"},
     {WM_IME_NOTIFY, "WM_IME_NOTIFY"},
     {WM_IME_REQUEST, "WM_IME_REQUEST"},
-    {WM_DISPLAYCHANGE, "WM_DISPLAYCHANGE"}
+    {WM_DISPLAYCHANGE, "WM_DISPLAYCHANGE"},
+    {WM_THEMECHANGED , "WM_THEMECHANGED"}
 };
 
 static inline const MessageDebugEntry *messageDebugEntry(UINT msg)