Bugfix: Qt/Intro: Pruned nodes never require *more* space

src/qt/intro.cpp

@@ -127,7 +127,10 @@ Intro::Intro(QWidget *parent) :
     uint64_t pruneTarget = std::max<int64_t>(0, GetArg("-prune", 0));
     requiredSpace = BLOCK_CHAIN_SIZE;
     if (pruneTarget) {
-        requiredSpace = std::ceil(pruneTarget * 1024 * 1024.0 / GB_BYTES);
+        uint64_t prunedGBs = std::ceil(pruneTarget * 1024 * 1024.0 / GB_BYTES);
+        if (prunedGBs <= requiredSpace) {
+            requiredSpace = prunedGBs;
+        }
     }
     requiredSpace += CHAIN_STATE_SIZE;
     ui->sizeWarningLabel->setText(ui->sizeWarningLabel->text().arg(tr(PACKAGE_NAME)).arg(requiredSpace));