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[backport#12173] [Qt] Use flexible font size for QRCode image address
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Authored by majcosta on Sep 22 2020, 16:30.

Details

Summary

Use flexible font size for QRCode image address (Jonas Schnelli)

Pull request description:

Bech32 addresses are currently cut off in the QRCode image in the GUI receive tab.
This adds a simple font size calculation logic that "must" (down to 4pt) fix into the given image width.

Examples OSX HiDPI:
<img width="332" alt="bildschirmfoto 2018-01-12 um 11 25 40" src="https://user-images.githubusercontent.com/178464/34896144-c0c65d76-f78c-11e7-93e1-94dc8e203269.png">
<img width="322" alt="bildschirmfoto 2018-01-12 um 11 25 46" src="https://user-images.githubusercontent.com/178464/34896145-c0edfe1c-f78c-11e7-8c09-c15155e2160e.png">

Examples Ubuntu non HIDPI:
<img width="314" alt="bildschirmfoto 2018-01-12 um 11 27 51" src="https://user-images.githubusercontent.com/178464/34896151-c88347f4-f78c-11e7-8a03-df8049dcfed6.png">
<img width="322" alt="bildschirmfoto 2018-01-12 um 11 27 42" src="https://user-images.githubusercontent.com/178464/34896152-c8bb881c-f78c-11e7-89d2-6f04ec608a19.png">

Backport of Core PR12173

Test Plan
ninja
bitcoin-qt -regtest, check the receive tab for correctness

Diff Detail

Repository
rABC Bitcoin ABC
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Unit
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This revision is now accepted and ready to land.Sep 22 2020, 16:37