Description: lxqt-config-monitor: Improve UI behind Apply button in Advanced
 settings dlg
 .
 This patch implements four UI changes explained elaborately below:
 .
 1) Activate existing Apply button in Advanced settings dialog
 .
 The Apply button now applies settings from the Saved Settings
 (LXQt::ConfigDialog) page.
 .
 It had no active connections before.
 .
 2) Show saved settings on select
 .
 Details for saved settings was shown on 'activation' signal which
 is on most platforms generated on mouse double-click or by
 pressing the Enter key. It is more natural to expect the details
 page to update on single mouse click or by selecting the
 next/previous item by down/up arrow keys.
 .
 On mouse double-click one would expect to actually _activate_ the
 setting, not merely show the details.
 .
 This also ensures, the selected settings is always displayed
 before applying.
 .
 3) Remove Apply button from Saved settings page
 .
 The button did its job applying only the local configuration from
 the Saved Settings (LXQt::ConfigDialog) page, but until there are
 more configuration pages in the dialog its purpose is hidden and
 confusing, appearing as a duplicate for the dialog's own Apply
 button.
 .
 The button may find its way back once it makes sense to have it
 there again.
 .
 4) Apply selected settings on mouse double-click
 .
 It is expected intuitively activating the selected saved settings
 on mouse double-click. Enable this behavior.
Author: vc-01 <vlado.chren@gmail.com>
Origin: upstream
Bug: https://github.com/lxqt/lxqt-config/issues/577
Applied-Upstream: 3005400ce273b117833a8043f03af39f7596101d
Last-Update: 2023-12-22
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/lxqt-config-monitor/managesavedsettings.cpp
+++ b/lxqt-config-monitor/managesavedsettings.cpp
@@ -23,6 +23,7 @@
 #include "monitor.h"
 #include <QDebug>
 #include <QInputDialog>
+#include <QMessageBox>
 #include <QDateTime>
 
 Q_DECLARE_METATYPE(MonitorSavedSettings)
@@ -37,18 +38,21 @@ ManageSavedSettings::ManageSavedSettings
 
     ui.setupUi(this);
 
-    connect(ui.allConfigs,       &QListWidget::itemActivated, this, &ManageSavedSettings::showSelectedConfig);
-    connect(ui.deletePushButton, &QPushButton::clicked,       this, &ManageSavedSettings::onDeleteItem);
-    connect(ui.renamePushButton, &QPushButton::clicked,       this, &ManageSavedSettings::onRenameItem);
-    connect(ui.applyPushButton,  &QPushButton::clicked,       this, &ManageSavedSettings::onApplyItem);
+    connect(ui.allConfigs,       &QListWidget::itemSelectionChanged, this, &ManageSavedSettings::showSelectedConfig);
+    connect(ui.allConfigs,       &QListWidget::itemDoubleClicked,    this, &ManageSavedSettings::onApplyItem);
+    connect(ui.deletePushButton, &QPushButton::clicked,              this, &ManageSavedSettings::onDeleteItem);
+    connect(ui.renamePushButton, &QPushButton::clicked,              this, &ManageSavedSettings::onRenameItem);
 
     loadSettings();
 }
 
 
-void ManageSavedSettings::showSelectedConfig(QListWidgetItem * item)
+void ManageSavedSettings::showSelectedConfig()
 {
-    MonitorSavedSettings o = item->data(Qt::UserRole).value<MonitorSavedSettings>();
+    QListWidgetItem * currItem = ui.allConfigs->currentItem();
+    if (currItem == nullptr)
+        return;
+    MonitorSavedSettings o = currItem->data(Qt::UserRole).value<MonitorSavedSettings>();
     QString text;
     for(int i=0; i < o.monitors.size(); i++) {
         MonitorSettings setting = o.monitors[i];
@@ -77,7 +81,6 @@ void ManageSavedSettings::showSelectedCo
     }
     text += QLatin1String("<br/>");
     ui.selectedSettingsTextEdit->setText(text);
-    ui.applyPushButton->setEnabled(isHardwareCompatible(o));
 }
 
 
@@ -164,6 +167,14 @@ void ManageSavedSettings::onApplyItem()
     if (ui.allConfigs->currentItem() == nullptr)
         return;
     MonitorSavedSettings settings = ui.allConfigs->currentItem()->data(Qt::UserRole).value<MonitorSavedSettings>();
+
+    if (!isHardwareCompatible(settings)) {
+        QMessageBox::information(this, tr("Settings Activation Failed"),
+                                 tr("Selected settings cannot be applied with currently active monitors.\n\n"
+                                    "Please choose from the highlighted configurations."));
+        return;
+    }
+
     applySettings(config, settings.monitors);
 }
 
--- a/lxqt-config-monitor/managesavedsettings.h
+++ b/lxqt-config-monitor/managesavedsettings.h
@@ -41,7 +41,7 @@ public slots:
    */
   void loadSettings();
 
-  void showSelectedConfig(QListWidgetItem * item);
+  void showSelectedConfig();
 
   void onDeleteItem();
 
--- a/lxqt-config-monitor/managesavedsettings.ui
+++ b/lxqt-config-monitor/managesavedsettings.ui
@@ -46,13 +46,6 @@
             </property>
            </widget>
           </item>
-          <item>
-           <widget class="QPushButton" name="applyPushButton">
-            <property name="text">
-             <string>Apply</string>
-            </property>
-           </widget>
-          </item>
          </layout>
         </item>
         <item row="0" column="1">
--- a/lxqt-config-monitor/settingsdialog.cpp
+++ b/lxqt-config-monitor/settingsdialog.cpp
@@ -31,4 +31,10 @@ SettingsDialog::SettingsDialog(const QSt
 
     ManageSavedSettings * savedSettings = new ManageSavedSettings(settings, config, this);
     addPage(savedSettings, QObject::tr("Manage Saved Settings"), QStringLiteral("system-run"));
+
+    connect(this, &LXQt::ConfigDialog::clicked, [=] (QDialogButtonBox::StandardButton button) {
+        if(button == QDialogButtonBox::Apply) {
+            savedSettings->onApplyItem();
+        }
+    });
 }