Jonas Schnelli d7f5e01e30
Merge #18424: qt: Use parent-child relation to manage lifetime of OptionsModel object
8e08d005989c6b5f7f05e0a1e0ba84f544a76d01 qt: Use parent-child relation to manage lifetime of OptionsModel object (Hennadii Stepanov)

Pull request description:

  Both `BitcoinApplication` and `OptionsModel` classes are derived from the `QObject` class, therefore a parent-child relation could be established to manage the lifetime of an `OptionsModel` object:
  5236b2e267/src/qt/optionsmodel.cpp (L29-L30)

  This PR does not change behavior.

ACKs for top commit:
  jonasschnelli:
    utACK 8e08d005989c6b5f7f05e0a1e0ba84f544a76d01
  promag:
    ACK 8e08d005989c6b5f7f05e0a1e0ba84f544a76d01.

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