Widgets/Stylesheets: compile without FEATURE_style_stylesheet

Make sure to not compile the stylesheet sources when
FEATURE_style_stylesheet is disabled, also don't include the relevant
headers in this case.

Fixes: QTBUG-136341
Change-Id: I4fc2de2fcba004b93140809ef79374401209f14a
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit e57fff63419867d59b6067fc1a5a3495678708dc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/widgets/CMakeLists.txt

@@ -43,8 +43,6 @@ qt_internal_add_module(Widgets
         styles/qstyleoption.cpp styles/qstyleoption.h
         styles/qstylepainter.cpp styles/qstylepainter.h
         styles/qstyleplugin.cpp styles/qstyleplugin.h
-        styles/qstylesheetstyle.cpp styles/qstylesheetstyle_p.h
-        styles/qstylesheetstyle_default.cpp
         util/qcolormap.cpp util/qcolormap.h
         util/qsystemtrayicon.cpp util/qsystemtrayicon.h util/qsystemtrayicon_p.h
         widgets/qabstractscrollarea.cpp widgets/qabstractscrollarea.h widgets/qabstractscrollarea_p.h
@@ -425,6 +423,12 @@ qt_internal_extend_target(Widgets CONDITION QT_FEATURE_animation
         styles/qstyleanimation.cpp styles/qstyleanimation_p.h
 )
 
+qt_internal_extend_target(Widgets CONDITION QT_FEATURE_style_stylesheet
+    SOURCES
+        styles/qstylesheetstyle.cpp styles/qstylesheetstyle_p.h
+        styles/qstylesheetstyle_default.cpp
+)
+
 qt_internal_extend_target(Widgets CONDITION QT_FEATURE_style_windows
     SOURCES
         styles/qwindowsstyle.cpp styles/qwindowsstyle_p.h

src/widgets/kernel/qapplication.cpp

@@ -33,7 +33,9 @@
 #include "private/qguiapplication_p.h"
 #include "qcolormap.h"
 #include "qdebug.h"
+#if QT_CONFIG(style_stylesheet)
 #include "private/qstylesheetstyle_p.h"
+#endif
 #include "private/qstyle_p.h"
 #if QT_CONFIG(messagebox)
 #include "qmessagebox.h"

src/widgets/kernel/qtooltip.cpp

@@ -16,7 +16,9 @@
 #include <qdebug.h>
 #include <qpa/qplatformscreen.h>
 #include <qpa/qplatformcursor.h>
+#if QT_CONFIG(style_stylesheet)
 #include <private/qstylesheetstyle_p.h>
+#endif
 
 #include <qlabel.h>
 #include <QtWidgets/private/qlabel_p.h>

src/widgets/kernel/qwidget.cpp

@@ -36,7 +36,9 @@
 #include "qwhatsthis.h"
 #endif
 #include "qdebug.h"
+#if QT_CONFIG(style_stylesheet)
 #include "private/qstylesheetstyle_p.h"
+#endif
 #include "private/qstyle_p.h"
 #include "qfileinfo.h"
 #include "qscopeguard.h"

src/widgets/widgets/qdockwidget.cpp

@@ -17,7 +17,6 @@
 #include <qdebug.h>
 
 #include <private/qwidgetresizehandler_p.h>
-#include <private/qstylesheetstyle_p.h>
 #include <qpa/qplatformtheme.h>
 
 #include <private/qhighdpiscaling_p.h>

src/widgets/widgets/qlabel.cpp

@@ -8,9 +8,11 @@
 #include "qstyleoption.h"
 #include "qlabel_p.h"
 #include "private/qhexstring_p.h"
-#include "private/qstylesheetstyle_p.h"
 #include <qmath.h>
 
+#if QT_CONFIG(style_stylesheet)
+#include "private/qstylesheetstyle_p.h"
+#endif
 #if QT_CONFIG(abstractbutton)
 #include "qabstractbutton.h"
 #endif

src/widgets/widgets/qlineedit.cpp

@@ -41,8 +41,9 @@
 #if QT_CONFIG(itemviews)
 #include "qabstractitemview.h"
 #endif
+#if QT_CONFIG(style_stylesheet)
 #include "private/qstylesheetstyle_p.h"
-
+#endif
 #if QT_CONFIG(shortcut)
 #include "private/qapplication_p.h"
 #include "private/qshortcutmap_p.h"