Be more explicit about Qt5::Widgets dependencies

Include when it's needed and explicitly link against it instead of
pulling it from KF5::WindowSystem

containmentactions/switchdesktop/CMakeLists.txt

@@ -7,6 +7,7 @@ add_library(plasma_containmentactions_switchdesktop MODULE ${switchdesktop_SRCS}
 kcoreaddons_desktop_to_json(plasma_containmentactions_switchdesktop plasma-containmentactions-switchdesktop.desktop)
 
 target_link_libraries(plasma_containmentactions_switchdesktop
+                        Qt5::Widgets
                         KF5::Plasma
                         KF5::WindowSystem
                         KF5::I18n

containmentactions/switchwindow/CMakeLists.txt

@@ -10,6 +10,7 @@ add_library(plasma_containmentactions_switchwindow MODULE ${switchwindow_SRCS})
 kcoreaddons_desktop_to_json(plasma_containmentactions_switchwindow plasma-containmentactions-switchwindow.desktop)
 
 target_link_libraries(plasma_containmentactions_switchwindow
+                      Qt5::Widgets
                       KF5::Plasma
                       KF5::KIOCore
                       KF5::I18n

libkworkspace/kworkspace.cpp

@@ -20,7 +20,6 @@
 #include "kworkspace.h"
 #include "config-libkworkspace.h"
 
-#include <QApplication>
 #include <QDataStream>
 #include <QFile>
 #include <QFileInfo>

libtaskmanager/xwindowtasksmodel.h

@@ -26,6 +26,7 @@ License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 #include "taskmanager_export.h"
 
 #include <QMimeData>
+#include <qwindowdefs.h>
 
 #include <netwm.h>