Merge #15040: qt: Add workaround for QProgressDialog bug on macOS

7c572c488 Add workaround for QProgressDialog bug on macOS (Hennadii Stepanov)

Pull request description:

  Fix #15016.

  Refs:
  - [QTBUG-65750: QProgressDialog too small width at larger font size on Mac](https://bugreports.qt.io/browse/QTBUG-65750)
  - [QTBUG-70357: QProgressDialog is too narrow to fit the text of its label](https://bugreports.qt.io/browse/QTBUG-70357)

  With this PR:
  ![screenshot from 2018-12-26 22-01-30](https://user-images.githubusercontent.com/32963518/50456571-1aa35b80-095e-11e9-8442-c285555f2bee.png)

Tree-SHA512: dde668dfa7d2144973c0e868aea7fdb7d90f78584836d024ffefb8df4a709d6842fa3601954759b4462856a80e81df15b861ea39506599230a16928b621d9f8f

1 files changed, 7 insertions, 11 deletions

diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index ddaf771fa..4417e48fb 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1245,25 +1245,21 @@ void BitcoinGUI::detectShutdown()
 
 void BitcoinGUI::showProgress(const QString &title, int nProgress)
 {
-    if (nProgress == 0)
-    {
-        progressDialog = new QProgressDialog(title, "", 0, 100);
+    if (nProgress == 0) {
+        progressDialog = new QProgressDialog(title, QString(), 0, 100);
+        GUIUtil::PolishProgressDialog(progressDialog);
         progressDialog->setWindowModality(Qt::ApplicationModal);
         progressDialog->setMinimumDuration(0);
-        progressDialog->setCancelButton(nullptr);
         progressDialog->setAutoClose(false);
         progressDialog->setValue(0);
-    }
-    else if (nProgress == 100)
-    {
-        if (progressDialog)
-        {
+    } else if (nProgress == 100) {
+        if (progressDialog) {
             progressDialog->close();
             progressDialog->deleteLater();
         }
-    }
-    else if (progressDialog)
+    } else if (progressDialog) {
         progressDialog->setValue(nProgress);
+    }
 }
 
 void BitcoinGUI::setTrayIconVisible(bool fHideTrayIcon)