diff --git a/3rdparty/ext_qt/CMakeLists.txt b/3rdparty/ext_qt/CMakeLists.txt
index ba606e1233..8e5d6b436e 100644
--- a/3rdparty/ext_qt/CMakeLists.txt
+++ b/3rdparty/ext_qt/CMakeLists.txt
@@ -1,183 +1,201 @@
 SET(EXTPREFIX_qt  "${EXTPREFIX}")
 if (WIN32)
+    list(APPEND _QT_conf -skip qt3d -skip qtactiveqt -skip qtcanvas3d
+        -skip qtconnectivity -skip qtdoc -skip qtenginio -skip qtgraphicaleffects
+        -skip qtlocation -skip qtsensors -skip qtserialport -skip qtwayland
+        -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview
+        -skip qtxmlpatterns -no-sql-sqlite -nomake examples -nomake tools
+        -no-compile-examples -no-dbus -no-iconv -no-angle -no-qml-debug -no-ssl
+        -no-openssl -no-libproxy -no-system-proxies -no-icu -no-mtdev
+        -skip qtcharts -skip qtdatavis3d -skip qtgamepad -skip qtnetworkauth
+        -skip qtpurchasing -skip qtremoteobjects -skip qtscxml -skip qtserialbus
+        -skip qtspeech -skip qtvirtualkeyboard
+        #
+        -opengl desktop -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg
+        #
+        -opensource -confirm-license
+        #
+        -release -platform win32-g++ -prefix ${EXTPREFIX_qt}
+        # Uncomment this line for building Qt with debugging info enabled
+        #-force-debug-info
+    )
   ExternalProject_Add(
       ext_qt
       DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-      URL https://download.qt.io/official_releases/qt/5.6/5.6.1-1/single/qt-everywhere-opensource-src-5.6.1-1.zip
-      URL_MD5 9d7ea0cadcec7b5a63e8e83686756978
+      URL https://download.qt.io/archive/qt/5.9/5.9.1/single/qt-everywhere-opensource-src-5.9.1.zip
+      URL_MD5 3f2e538ccc468d28bcfdefac96d1e975
       PATCH_COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/disable-wintab.diff
             COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/qtgui-private-headers.diff
             COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/0001-Don-t-request-the-MIME-image-every-time-Windows-asks.patch
             COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/0002-Hack-always-return-we-support-DIBV5.patch
             COMMAND  ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/0003-Hack-for-fullscreen-workaround.patch
 
       INSTALL_DIR ${EXTPREFIX_qt}
-      CONFIGURE_COMMAND <SOURCE_DIR>/configure.bat -skip qt3d -skip qtactiveqt -skip qtcanvas3d -skip qtconnectivity -skip qtdoc -skip qtenginio -skip qtgraphicaleffects -skip qtlocation -skip qtsensors -skip qtserialport -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtxmlpatterns -no-sql-sqlite -nomake examples -nomake tools -no-compile-examples -no-dbus -no-iconv -no-angle -no-ssl -no-openssl -no-wmf-backend -no-qml-debug -no-libproxy -no-system-proxies -no-nis -no-icu -no-mtdev -opensource -confirm-license -release -opengl desktop -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -prefix ${EXTPREFIX_qt} -platform win32-g++
-
-      # use this line for building Qt with debugging info enabled
-      #CONFIGURE_COMMAND <SOURCE_DIR>/configure.bat -release -force-debug-info -skip qt3d -skip qtactiveqt -skip qtcanvas3d -skip qtconnectivity -skip qtdoc -skip qtenginio -skip qtgraphicaleffects -skip qtlocation -skip qtsensors -skip qtserialport -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtxmlpatterns -no-sql-sqlite -nomake examples -nomake tools -no-compile-examples -no-dbus -no-iconv -no-angle -no-ssl -no-openssl -no-wmf-backend -no-qml-debug -no-libproxy -no-system-proxies -no-nis -no-icu -no-mtdev -opensource -confirm-license -release -opengl desktop -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -prefix ${EXTPREFIX_qt} -platform win32-g++
+      CONFIGURE_COMMAND <SOURCE_DIR>/configure.bat ${_QT_conf}
 
       BUILD_COMMAND mingw32-make -j${SUBMAKE_JOBS}
       INSTALL_COMMAND mingw32-make -j${SUBMAKE_JOBS} install
       UPDATE_COMMAND ""
-      BUILD_IN_SOURCE 1
+      # Use a short name to reduce the chance of exceeding path length limit
+      SOURCE_DIR s
+      BINARY_DIR b
       DEPENDS ext_patch
   )
 elseif (NOT APPLE)
   ExternalProject_Add(
       ext_qt
       DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
       URL https://download.qt.io/official_releases/qt/5.6/5.6.1-1/single/qt-everywhere-opensource-src-5.6.1-1.tar.gz
       URL_MD5 8fdec6d657bc370bd3183d8fe8e9c47a
       PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/qt-no-motion-compression.diff
 
       INSTALL_DIR ${EXTPREFIX_qt}
       CONFIGURE_COMMAND <SOURCE_DIR>/configure -prefix ${EXTPREFIX_qt} -opensource -confirm-license -nomake examples -no-sql-sqlite -no-openssl -no-qml-debug -no-mtdev  -no-journald  -no-syslog -no-nis  -no-cups -no-tslib -no-directfb -no-linuxfb -no-libproxy -no-pch -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg  -qt-harfbuzz -qt-freetype -qt-xcb -qt-xkbcommon-x11 -optimized-qmake -skip qt3d -skip qtactiveqt -skip qtcanvas3d -skip qtconnectivity -skip qtenginio -skip qtgraphicaleffects -skip qtlocation -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtandroidextras -skip qtserialport
 
       BUILD_COMMAND $(MAKE)
       INSTALL_COMMAND $(MAKE) install
       UPDATE_COMMAND ""
       BUILD_IN_SOURCE 1
   )
 else( APPLE )
 
       # XCODE_VERSION is set by CMake when using the Xcode generator, otherwise we need
       # to detect it manually here.
       if (NOT XCODE_VERSION)
         execute_process(
           COMMAND xcodebuild -version
           OUTPUT_VARIABLE xcodebuild_version
           OUTPUT_STRIP_TRAILING_WHITESPACE
           ERROR_FILE /dev/null
         )
         string(REGEX MATCH "Xcode ([0-9]([.][0-9])+)" version_match ${xcodebuild_version})
         if (version_match)
           message(STATUS "${EXTPREFIX_qt}:Identified Xcode Version: ${CMAKE_MATCH_1}")
           set(XCODE_VERSION ${CMAKE_MATCH_1})
         else()
           # If detecting Xcode version failed, set a crazy high version so we default
           # to the newest.
           set(XCODE_VERSION 99)
           message(WARNING "${EXTPREFIX_qt}:Failed to detect the version of an installed copy of Xcode, falling back to highest supported version. Set XCODE_VERSION to override.")
         endif(version_match)
       endif(NOT XCODE_VERSION)
 
       # -------------------------------------------------------------------------------
       # Verify the Xcode installation on Mac OS like Qt5.7 does/will
       # If not stop now, the system isn't configured correctly for Qt.
       # No reason to even proceed.
       # -------------------------------------------------------------------------------
       set(XCSELECT_OUTPUT)
       find_program(XCSELECT_PROGRAM "xcode-select")
       if(XCSELECT_PROGRAM)
         message(STATUS "${EXTPREFIX_qt}:Found XCSELECT_PROGRAM as ${XCSELECT_PROGRAM}")
         set(XCSELECT_COMMAND ${XCSELECT_PROGRAM}
           "--print-path")
         execute_process(
           COMMAND ${XCSELECT_COMMAND}
           RESULT_VARIABLE XCSELECT_COMMAND_RESULT
           OUTPUT_VARIABLE XCSELECT_COMMAND_OUTPUT
           ERROR_FILE /dev/null
         )
         if(NOT XCSELECT_COMMAND_RESULT)
           # returned 0, we're ok.
           string(REGEX REPLACE
             "[ \t]*[\r\n]+[ \t]*" ";"
             XCSELECT_COMMAND_OUTPUT ${XCSELECT_COMMAND_OUTPUT})
         else()
           string(REPLACE ";" " " XCSELECT_COMMAND_STR "${XCSELECT_COMMAND}")
           # message(STATUS "${XCSELECT_COMMAND_STR}")
           message(FATAL_ERROR "${EXTPREFIX_qt}:${XCSELECT_PROGRAM} test failed with status ${XCSELECT_COMMAND_RESULT}")
         endif()
       else()
         message(FATAL_ERROR "${EXTPREFIX_qt}:${XCSELECT_PROGRAM} not found. No Xcode is selected. Use xcode-select -switch to choose an Xcode version")
       endif()
 
       # Belts and suspenders
       # Beyond all the Xcode and Qt version checking, the proof of the pudding
       # lies in the success/failure of this command: xcrun --find xcrun.
       # On failure a patch is necessary, otherwise we're ok
       # So hard check xcrun now...
       set(XCRUN_OUTPUT)
       find_program(XCRUN_PROGRAM "xcrun")
       if(XCRUN_PROGRAM)
         message(STATUS "${EXTPREFIX_qt}:Found XCRUN_PROGRAM as ${XCRUN_PROGRAM}")
         set(XCRUN_COMMAND ${XCRUN_PROGRAM}
           "--find xcrun")
         execute_process(
           COMMAND ${XCRUN_COMMAND}
           RESULT_VARIABLE XCRUN_COMMAND_RESULT
           OUTPUT_VARIABLE XCRUN_COMMAND_OUTPUT
           ERROR_FILE /dev/null
         )
         if(NOT XCRUN_COMMAND_RESULT)
           # returned 0, we're ok.
           string(REGEX REPLACE
             "[ \t]*[\r\n]+[ \t]*" ";"
             XCRUN_COMMAND_OUTPUT ${XCRUN_COMMAND_OUTPUT})
         else()
           string(REPLACE ";" " " XCRUN_COMMAND_STR "${XCRUN_COMMAND}")
           # message(STATUS "${XCRUN_COMMAND_STR}")
           message(STATUS "${EXTPREFIX_qt}:xcrun test failed with status ${XCRUN_COMMAND_RESULT}")
         endif()
       else()
         message(STATUS "${EXTPREFIX_qt}:xcrun not found -- ${XCRUN_PROGRAM}")
       endif()
       #
       # Now configure ext_qt accordingly
       #
       if ((XCRUN_COMMAND_RESULT) AND (NOT (XCODE_VERSION VERSION_LESS 8.0.0)))
         # Fix Xcode xcrun related issue.
         # NOTE: This should be fixed by Qt 5.7.1 see here: http://code.qt.io/cgit/qt/qtbase.git/commit/?h=dev&id=77a71c32c9d19b87f79b208929e71282e8d8b5d9
         # NOTE: but no one's holding their breath.
         set(ext_qt_PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/gerrit-166202.diff
                 COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/macdeploy-qt.diff
                 COMMAND ${PATCH_COMMAND} -p1 -b -d <SOURCE_DIR>/qtbase -i ${CMAKE_CURRENT_SOURCE_DIR}/qtbase-configure.patch
                 COMMAND ${PATCH_COMMAND} -p1 -b -d <SOURCE_DIR>/qtbase/mkspecs/features/mac -i ${CMAKE_CURRENT_SOURCE_DIR}/mac-default.patch)
         message(STATUS "${EXTPREFIX_qt}:Additional patches injected.")
       else()
         # No extra patches will be applied
         # NOTE: defaults for some untested scenarios like xcrun fails and xcode_version < 8.
         # NOTE: that is uncharted territory and (hopefully) a very unlikely scenario...
         set(ext_qt_PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/gerrit-166202.diff
                 COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/macdeploy-qt.diff)
       endif()
 
       # Qt is big - try and parallelize if at all possible
       include(ProcessorCount)
       ProcessorCount(NUM_CORES)
       if(NOT NUM_CORES EQUAL 0)
         if (NUM_CORES GREATER 2)
           # be nice...
           MATH( EXPR NUM_CORES "${NUM_CORES} - 2" )
         endif()
         set(PARALLEL_MAKE "make;-j${NUM_CORES}")
         message(STATUS "${EXTPREFIX_qt}:Parallelized make: ${PARALLEL_MAKE}")
       else()
         set(PARALLEL_MAKE "make")
       endif()
 
       ExternalProject_Add(ext_qt
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
 
         LOG_DOWNLOAD        ON
         LOG_UPDATE          ON
         LOG_CONFIGURE       ON
         LOG_BUILD           ON
         LOG_TEST            ON
         LOG_INSTALL         ON
         BUILD_IN_SOURCE 		ON
 
         URL https://download.qt.io/official_releases/qt/5.7/5.7.0/single/qt-everywhere-opensource-src-5.7.0.tar.gz
         URL_MD5 9a46cce61fc64c20c3ac0a0e0fa41b42
 
         PATCH_COMMAND ${ext_qt_PATCH_COMMAND}
 
         INSTALL_DIR ${EXTPREFIX_qt}
         CONFIGURE_COMMAND <SOURCE_DIR>/configure -confirm-license  -opensource -nomake examples -no-openssl -no-compile-examples -qt-freetype -qt-harfbuzz -opengl desktop -qt-zlib -qt-pcre -qt-libpng -qt-libjpeg -skip qt3d -skip qtactiveqt -skip qtcanvas3d -skip qtconnectivity -skip qtgraphicaleffects -skip qtlocation -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebsockets -skip qtwebview -skip qtxmlpatterns -prefix ${EXTPREFIX_qt}
         BUILD_COMMAND ${PARALLEL_MAKE}
         INSTALL_COMMAND make install
         UPDATE_COMMAND ""
         BUILD_IN_SOURCE 1
       )
 endif()
diff --git a/3rdparty/ext_qt/disable-wintab.diff b/3rdparty/ext_qt/disable-wintab.diff
index 6a98378662..8484959597 100644
--- a/3rdparty/ext_qt/disable-wintab.diff
+++ b/3rdparty/ext_qt/disable-wintab.diff
@@ -1,68 +1,68 @@
 diff --git a/qtbase/src/plugins/platforms/windows/qwindowscontext.cpp b/qtbase/src/plugins/platforms/windows/qwindowscontext.cpp
 index 4934b6c..613e8fe 100644
 --- a/qtbase/src/plugins/platforms/windows/qwindowscontext.cpp
 +++ b/qtbase/src/plugins/platforms/windows/qwindowscontext.cpp
-@@ -299,9 +299,6 @@ struct QWindowsContextPrivate {
+@@ -238,9 +238,6 @@
      QWindowsMimeConverter m_mimeConverter;
      QWindowsScreenManager m_screenManager;
      QSharedPointer<QWindowCreationContext> m_creationContext;
--#if !defined(QT_NO_TABLETEVENT) && !defined(Q_OS_WINCE)
+-#if QT_CONFIG(tabletevent)
 -    QScopedPointer<QWindowsTabletSupport> m_tabletSupport;
 -#endif
      const HRESULT m_oleInitializeResult;
      const QByteArray m_eventType;
-     QWindow *m_lastActiveWindow;
-@@ -346,17 +343,10 @@ QWindowsContext::QWindowsContext() :
+     QWindow *m_lastActiveWindow = nullptr;
+@@ -279,17 +276,10 @@
      const QByteArray bv = qgetenv("QT_QPA_VERBOSE");
      if (!bv.isEmpty())
          QLoggingCategory::setFilterRules(QString::fromLocal8Bit(bv));
--#if !defined(QT_NO_TABLETEVENT) && !defined(Q_OS_WINCE)
+-#if QT_CONFIG(tabletevent)
 -    d->m_tabletSupport.reset(QWindowsTabletSupport::create());
 -    qCDebug(lcQpaTablet) << "Tablet support: " << (d->m_tabletSupport.isNull() ? QStringLiteral("None") : d->m_tabletSupport->description());
 -#endif
  }
  
  QWindowsContext::~QWindowsContext()
  {
--#if !defined(QT_NO_TABLETEVENT) && !defined(Q_OS_WINCE)
+-#if QT_CONFIG(tabletevent)
 -    d->m_tabletSupport.reset(); // Destroy internal window before unregistering classes.
 -#endif
      unregisterWindowClasses();
      if (d->m_oleInitializeResult == S_OK || d->m_oleInitializeResult == S_FALSE)
          OleUninitialize();
-@@ -397,12 +387,7 @@ bool QWindowsContext::initTouch(unsigned integrationOptions)
+@@ -335,12 +325,7 @@
  
  void QWindowsContext::setTabletAbsoluteRange(int a)
  {
--#if !defined(QT_NO_TABLETEVENT) && !defined(Q_OS_WINCE)
+-#if QT_CONFIG(tabletevent)
 -    if (!d->m_tabletSupport.isNull())
 -        d->m_tabletSupport->setAbsoluteRange(a);
 -#else
      Q_UNUSED(a)
 -#endif
  }
  
  int QWindowsContext::processDpiAwareness()
-@@ -792,11 +777,7 @@ QWindowsScreenManager &QWindowsContext::screenManager()
+@@ -700,11 +685,7 @@
  
  QWindowsTabletSupport *QWindowsContext::tabletSupport() const
  {
--#if !defined(QT_NO_TABLETEVENT) && !defined(Q_OS_WINCE)
+-#if QT_CONFIG(tabletevent)
 -    return d->m_tabletSupport.data();
 -#else
      return 0;
 -#endif
  }
  
  /*!
-@@ -1166,10 +1147,6 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
+@@ -1077,10 +1058,6 @@
              *result = LRESULT(MA_NOACTIVATE);
              return true;
          }
 -#ifndef QT_NO_TABLETEVENT
 -        if (!d->m_tabletSupport.isNull())
 -            d->m_tabletSupport->notifyActivate();
 -#endif // !QT_NO_TABLETEVENT
          if (platformWindow->testFlag(QWindowsWindow::BlockedByModal))
-             if (const QWindow *modalWindow = QGuiApplication::modalWindow())
-                 QWindowsWindow::baseWindowOf(modalWindow)->alertWindow();
+             if (const QWindow *modalWindow = QGuiApplication::modalWindow()) {
+                 QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(modalWindow);