QAndroidInputContext: Generate a QInputMethodEvent in reset()

Although QPlatformInputContext::reset() documentation says that reset()
should not send any QInputMethodEvents, implementations on Windows,
macOS and iOS do send a QInputMethodEvent which clears preedit text in
their reimplementations of reset(). Text editing controls depend on that
and may not clear preedit text if such event is not sent.

Change-Id: I75ab73946cb06e93e5fc5e98e0cc503a7de5c2e0
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/plugins/platforms/android/qandroidinputcontext.cpp

@@ -558,6 +558,7 @@ static inline int getBlockPosition(const QSharedPointer<QInputMethodQueryEvent>
 
 void QAndroidInputContext::reset()
 {
+    focusObjectStopComposing();
     clear();
     m_batchEditNestingLevel = 0;
     m_handleMode = Hidden;