Compare result of clickedButton instead of exec (#7438)

* Compare result of `clickedButton` instead of `exec` to workaround Qt 6.5 bug

* Update ChangeLog

* Fixed typo

* Add missing backticks

* Init as nullptr

ChangeLog

@@ -2,7 +2,7 @@
 
 Enhancements:
 
-- #7254 Bind client to a network interface with --address
+- #7254 Bind client to a network interface with `--address`
 - #7262 Backward compatibility for M1 and M2 builds
 - #7263 Change name of Flatpak uploaded to snapshots
 - #7265 Remove obtrusive Linux key press log messages
@@ -13,10 +13,10 @@ Enhancements:
 - #7284 Change session ID info log message to DEBUG2
 - #7283 Update all workflows and fix broken macOS workflows
 - #7313 Fix CodeQL workflow: Failed to perl 404 Not Found
-- #7317 Bump sonar-scanner-cli to 5.0.1.3006
+- #7317 Bump `sonar-scanner-cli` to 5.0.1.3006
 - #7318 Remove Azure Pipelines config entirely
 - #7319 Remove workflows for slow self-hosted RPi runners
-- #7320 Move build_version.py script to scripts dir
+- #7320 Move `build_version.py` script to scripts dir
 - #7321 Switch to GitHub hosted Mac M1 runner
 - #7322 Use C++20 and add Windows CMake preset
 - #7323 Add Linux and macOS CMake presets
@@ -41,7 +41,7 @@ Enhancements:
 - #7364 Format all source with Clang and introduce lint workflow
 - #7368 Make version check URL v1-specific and configurable
 - #7369 Re-implement packaging for GitHub workflows (Linux ARM)
-- #7372 Add Git SHA to about screen and --version
+- #7372 Add Git SHA to about screen and `--version`
 - #7373 Upgrade from Qt5 to Qt6 for more modern UI
 - #7374 Add missing DEB and RPM dependencies
 - #7376 Automated weekly build of Docker images for Linux runners
@@ -80,6 +80,7 @@ Enhancements:
 - #7435 Add reset settings menu action and env var
 - #7436 Introduced new env vars for testing
 - #7437 Show message box explaining why settings are read-only
+- #7438 Compare result of `clickedButton` instead of `exec`
 
 # 1.14.6
 

src/lib/gui/dialogs/UpgradeDialog.cpp

@@ -24,14 +24,22 @@
 
 UpgradeDialog::UpgradeDialog(QWidget *parent) : QMessageBox(parent) {
   setWindowTitle("Upgrade to access this feature");
-  addButton("Cancel", QMessageBox::RejectRole);
+  m_cancel = addButton("Cancel", QMessageBox::RejectRole);
-  addButton("Upgrade", QMessageBox::AcceptRole);
+  m_upgrade = addButton("Upgrade", QMessageBox::AcceptRole);
 }
 
 void UpgradeDialog::showDialog(const QString &text) {
   setText(text);
+  exec();
 
-  if (exec() == QMessageBox::Accepted) {
+  if (clickedButton() == m_upgrade) {
-    QDesktopServices::openUrl(QUrl(synergy::gui::kUrlUpgrade));
+    const auto url = QUrl(synergy::gui::kUrlUpgrade);
+    if (QDesktopServices::openUrl(url)) {
+      qDebug("opened url: %s", qUtf8Printable(url.toString()));
+    } else {
+      qCritical("failed to open url: %s", qUtf8Printable(url.toString()));
+    }
+  } else {
+    qDebug("upgrade was declined");
   }
 }

src/lib/gui/dialogs/UpgradeDialog.h

@@ -18,9 +18,14 @@
 #pragma once
 
 #include <QMessageBox>
+#include <QPushButton>
 
 class UpgradeDialog : public QMessageBox {
 public:
   explicit UpgradeDialog(QWidget *parent = nullptr);
   void showDialog(const QString &text);
+
+private:
+  QPushButton *m_upgrade = nullptr;
+  QPushButton *m_cancel = nullptr;
 };