Merge bitcoin#15371: gui: Uppercase bech32 addresses in qr codes

3407b44 gui: Uppercase bech32 addresses in qr codes (Ben Carman)

Pull request description:

  Closes bitcoin#12191

ACKs for commit 3407b4:
  meshcollider:
    utACK bitcoin@3407b44
  jonasschnelli:
    Re utACK 3407b44

Tree-SHA512: d63ecf8e9805c46c9f554cc929661a37837bc3ba9b7b931331c2a5c2b81468742e1819c9add73966083011709cc15ae1870a454348af8591b3d75d3765dca568

src/qt/guiutil.cpp

@@ -175,7 +175,9 @@ bool parseBitcoinURI(QString uri, SendCoinsRecipient *out)
 
 QString formatBitcoinURI(const SendCoinsRecipient &info)
 {
-    QString ret = QString("bitcoin:%1").arg(info.address);
+    bool bech_32 = info.address.startsWith(QString::fromStdString(Params().Bech32HRP() + "1"));
+
+    QString ret = QString("bitcoin:%1").arg(bech_32 ? info.address.toUpper() : info.address);
     int paramCount = 0;
 
     if (info.amount)