Merge #17031: gui: Prevent processing duplicate payment requests

3f89e1eb237efcbd6415ca2cd0acddb6596153d7 Prevent processing duplicate payment requests (João Barbosa)

Pull request description:

  Considering the following from Qt [src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm#L267](https://github.com/qt/qtbase/blob/13e0a36626bd75e631dd9536e795a494432b1945/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm#L267)

  ```cpp
  - (void)application:(NSApplication *)sender openFiles:(NSArray *)filenames
  {
      Q_UNUSED(filenames);
      Q_UNUSED(sender);

      for (NSString *fileName in filenames) {
          QString qtFileName = QString::fromNSString(fileName);
          if (inLaunch) {
              // We need to be careful because Cocoa will be nice enough to take
              // command line arguments and send them to us as events. Given the history
              // of Qt Applications, this will result in behavior people don't want, as
              // they might be doing the opening themselves with the command line parsing.
              if (qApp->arguments().contains(qtFileName))
                  continue;
          }
          QWindowSystemInterface::handleFileOpenEvent(qtFileName);
      }
  ```

  And that a2714a5c69f0b0506689af04c3e785f71ee0915d was merged, now Qt isn't able to filter out the above notifications, and then a [QFileOpenEvent](https://doc.qt.io/qt-5/qfileopenevent.html) event is delivered to `PaymentServer::eventFilter`, which in turn (re)adds the payment request.

  This change fixes #17025, but makes sense regardless of the issue.

ACKs for top commit:
  laanwj:
    Nah, this seems fine, utACK 3f89e1eb237efcbd6415ca2cd0acddb6596153d7
  Sjors:
    ACK 3f89e1e on macOS 10.14.6
  achow101:
    Code review ACK 3f89e1eb237efcbd6415ca2cd0acddb6596153d7

Tree-SHA512: dd1e0c73fd84953418173ca71f6f5a67ad74a5dc7e3b1d54915ef0545f513df6a24f27242a77bb094e2833a478e2f3bf30ecd50251f3c55b65e780097cb8ab4d

0 files changed, 0 insertions, 0 deletions