Jonas Schnelli c2c15ea54e
Merge #17908: qt: Remove QFont warnings with QT_QPA_PLATFORM=minimal
1122817c194ed49abf896e68604e725c3b5c8569 qt: Remove QFont warnings with QPA=minimal (Hennadii Stepanov)

Pull request description:

  This PR removes massive warnings like:
  ```
  QWARN  : ... QFont::setPointSizeF: Point size <= 0 (...), must be greater than 0
  ```

  from `test_bitcoin-qt` output.

  On master (e258ce792a4849927a6db51786732d71cbbb65fc):
  ```
  $ ./src/qt/test/test_bitcoin-qt | grep QFont | wc -l
  ~BitcoinApplication : Stopping thread
  ~BitcoinApplication : Stopped thread
  57
  ```

  With this PR:
  ```
  $ ./src/qt/test/test_bitcoin-qt | grep QFont | wc -l
  ~BitcoinApplication : Stopping thread
  ~BitcoinApplication : Stopped thread
  0
  ```

ACKs for top commit:
  promag:
    Code review ACK 1122817c194ed49abf896e68604e725c3b5c8569.
  jonasschnelli:
    utACK 1122817c194ed49abf896e68604e725c3b5c8569

Tree-SHA512: 32fa72a5d3db1d4c73a2a324aa9cad807ee46f23fc5319f7d71202987dc73ea7c90082904489b323a432e1afaebd9976b7dd0374236a16153162aa75fe368723
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