Merge bitcoin-core/gui#71: Fix visual quality of text in QR image

6954156b4091bc1e561502f0eef0cece56c76eec qt: Fix visual quality of text in QR image (Hennadii Stepanov)
8071c75d45e12c2bca04b170c687bebd30ad19ac qt, refactor: Limit scope of QPainter object (Hennadii Stepanov)

Pull request description:

  Master (197450f80868fe752c6107955e5da80704212b34):
  ![DeepinScreenshot_select-area_20200824001800](https://user-images.githubusercontent.com/32963518/90988962-96283680-e59f-11ea-8e20-42e9b23033f5.png)

  This PR (6954156b4091bc1e561502f0eef0cece56c76eec):
  - macOS 10.15.6
  ![Screenshot from 2020-09-07 15-40-30](https://user-images.githubusercontent.com/32963518/92390251-2c716600-f123-11ea-96f0-0e9d35810c76.png)

  - Linux Mint 20
  ![Screenshot from 2020-09-07 15-48-13](https://user-images.githubusercontent.com/32963518/92390272-36936480-f123-11ea-8fee-4de23bb40ed9.png)

  Fix #54
  Fix https://github.com/bitcoin/bitcoin/issues/19103

  ---

  The first commit is easy to review with [`git diff --word-diff`](https://github.com/bitcoin-core/gui/pull/71/commits/8071c75d45e12c2bca04b170c687bebd30ad19ac?w=1).

ACKs for top commit:
  jonasschnelli:
    Tested ACK 6954156b4091bc1e561502f0eef0cece56c76eec - tested on macOS 10.15. Fixes the problem.

Tree-SHA512: 6ecb3397d2a5094c5f00ee05fc09520751568404e000a8691b6de7e57f38c2d5da628694e5e45a2b4cc302a846bbc00014c40820233eb026d3ebd4f68c2c9913

0 files changed, 0 insertions, 0 deletions