Unify QIcon theme icon loading and cache invalidation

The logic for invalidating a theme QIcon when the platform theme
changed, or when the user set an explicit icon theme, was tied
to QIconLoaderEngine, so any platform theme implementing
QPlatformTheme::createIconEngine() with a custom icon engine
would not take part in this cache invalidation.

As we want users of QIcon::fromTheme to be agnostic to where the
icon is actually coming from, and have a consistent behavior for
the various QIcon APIs for setting explicit themes, the logic
for invalidating the themed icon has now been moved up one
layer, to a new QThemeIconEngine, that is responsible for
lazily creating the actual engine based on the name. The
engine proxies the actual icon loading through to the
real engine via a new QProxyIconEngine helper class.

Pick-to: 6.6
Change-Id: I474589981f751d7467e3073533cba542182f2d36
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index 1b182d971d..37cefa9a25 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -62,7 +62,7 @@ qt_internal_add_module(Gui
         image/qbitmap.cpp image/qbitmap.h
         image/qbmphandler.cpp image/qbmphandler_p.h
         image/qicon.cpp image/qicon.h image/qicon_p.h
-        image/qiconengine.cpp image/qiconengine.h
+        image/qiconengine.cpp image/qiconengine.h image/qiconengine_p.h
         image/qiconengineplugin.cpp image/qiconengineplugin.h
         image/qiconloader.cpp image/qiconloader_p.h
         image/qimage.cpp image/qimage.h image/qimage_p.h