Fix applying font and option settings

Move the code which applies changes to applyChanges() method.

Fixes: QTBUG-77399
Change-Id: Ic4436ce65e246c518a6fcdfe119df772a0585468
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

3 files changed, 26 insertions, 35 deletions

diff --git a/src/assistant/assistant/mainwindow.cpp b/src/assistant/assistant/mainwindow.cpp
index 2b9c87bbf..fc5fe5b3f 100644
--- a/src/assistant/assistant/mainwindow.cpp
+++ b/src/assistant/assistant/mainwindow.cpp
@@ -842,7 +842,7 @@ void MainWindow::showPreferences()
             m_centralWidget, &CentralWidget::updateBrowserFont);
     connect(&dia, &PreferencesDialog::updateUserInterface,
             m_centralWidget, &CentralWidget::updateUserInterface);
-    dia.showDialog();
+    dia.exec();
 }
 
 void MainWindow::syncContents()
diff --git a/src/assistant/assistant/preferencesdialog.cpp b/src/assistant/assistant/preferencesdialog.cpp
index 7955e08df..67f91326c 100644
--- a/src/assistant/assistant/preferencesdialog.cpp
+++ b/src/assistant/assistant/preferencesdialog.cpp
@@ -142,31 +142,6 @@ PreferencesDialog::PreferencesDialog(QWidget *parent)
         setFont(helpEngine.appFont());
 }
 
-PreferencesDialog::~PreferencesDialog()
-{
-    if (m_appFontChanged) {
-        helpEngine.setAppFont(m_appFontPanel->selectedFont());
-        helpEngine.setUseAppFont(m_appFontPanel->isChecked());
-        helpEngine.setAppWritingSystem(m_appFontPanel->writingSystem());
-        emit updateApplicationFont();
-    }
-
-    if (m_browserFontChanged) {
-        helpEngine.setBrowserFont(m_browserFontPanel->selectedFont());
-        helpEngine.setUseBrowserFont(m_browserFontPanel->isChecked());
-        helpEngine.setBrowserWritingSystem(m_browserFontPanel->writingSystem());
-        emit updateBrowserFont();
-    }
-
-    QString homePage = m_ui.homePageLineEdit->text();
-    if (homePage.isEmpty())
-        homePage = QLatin1String("help");
-    helpEngine.setHomePage(homePage);
-
-    int option = m_ui.helpStartComboBox->currentIndex();
-    helpEngine.setStartOption(option);
-}
-
 FilterSetup PreferencesDialog::readOriginalSetup() const
 {
     FilterSetup filterSetup;
@@ -195,12 +170,6 @@ FilterSetup PreferencesDialog::readOriginalSetup() const
     return filterSetup;
 }
 
-void PreferencesDialog::showDialog()
-{
-    if (exec() != Accepted)
-        m_appFontChanged = m_browserFontChanged = false;
-}
-
 void PreferencesDialog::updateFilterPage()
 {
     if (m_hideFiltersTab)
@@ -563,6 +532,30 @@ void PreferencesDialog::applyChanges()
     helpEngine.setShowTabs(m_ui.showTabs->isChecked());
     if (m_showTabs != m_ui.showTabs->isChecked())
         emit updateUserInterface();
+
+    if (m_appFontChanged) {
+        helpEngine.setAppFont(m_appFontPanel->selectedFont());
+        helpEngine.setUseAppFont(m_appFontPanel->isChecked());
+        helpEngine.setAppWritingSystem(m_appFontPanel->writingSystem());
+        emit updateApplicationFont();
+        m_appFontChanged = false;
+    }
+
+    if (m_browserFontChanged) {
+        helpEngine.setBrowserFont(m_browserFontPanel->selectedFont());
+        helpEngine.setUseBrowserFont(m_browserFontPanel->isChecked());
+        helpEngine.setBrowserWritingSystem(m_browserFontPanel->writingSystem());
+        emit updateBrowserFont();
+        m_browserFontChanged = false;
+    }
+
+    QString homePage = m_ui.homePageLineEdit->text();
+    if (homePage.isEmpty())
+        homePage = QLatin1String("help");
+    helpEngine.setHomePage(homePage);
+
+    const int option = m_ui.helpStartComboBox->currentIndex();
+    helpEngine.setStartOption(option);
 }
 
 void PreferencesDialog::updateFontSettingsPage()
diff --git a/src/assistant/assistant/preferencesdialog.h b/src/assistant/assistant/preferencesdialog.h
index 89c30c568..1ff39e326 100644
--- a/src/assistant/assistant/preferencesdialog.h
+++ b/src/assistant/assistant/preferencesdialog.h
@@ -29,6 +29,7 @@
 #ifndef PREFERENCESDIALOG_H
 #define PREFERENCESDIALOG_H
 
+#include <QtCore/QVersionNumber>
 #include <QtWidgets/QDialog>
 #include <QtHelp/QHelpFilterData>
 #include "ui_preferencesdialog.h"
@@ -60,9 +61,6 @@ class PreferencesDialog : public QDialog
 
 public:
     PreferencesDialog(QWidget *parent = nullptr);
-    ~PreferencesDialog() override;
-
-    void showDialog();
 
 private slots:
     void filterSelected(QListWidgetItem *item);