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Merge #18062: gui: Fix unintialized WalletView::progressDialog

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acf8abc7f3cf7efa418a46f9f69f23f1a5035582 gui: Fix unintialized WalletView::progressDialog (João Barbosa)

Pull request description:

  #17911 shows that it's possible to read the unintialized `progressDialog` in f32564f0a7/src/qt/walletview.cpp (L296-L297).

  And the debugger shows
  ```
  (gdb) bt
  #0  0x0000555556687c60 in QProgressDialog::wasCanceled() const ()
  #1  0x000055555572989f in WalletView::showProgress (this=0x5555577d7a70,
      title=..., nProgress=1) at qt/walletview.cpp:322
  ```

  Closes #17911.

ACKs for top commit:
  hebasto:
    ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582, I have reviewed the code and it looks OK, I agree it can be merged.
  elichai:
    utACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582
  kristapsk:
    ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582
  MarcoFalke:
    ACK acf8abc7f3cf7efa418a46f9f69f23f1a5035582

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fanquake 2020-02-06 14:31:23 +08:00
commit 23fab1a3df
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src/qt/walletview.h
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@ -66,7 +66,7 @@ private:
TransactionView *transactionView;
QProgressDialog *progressDialog;
QProgressDialog* progressDialog{nullptr};
const PlatformStyle *platformStyle;
public Q_SLOTS: