Manager: Add a button to reset to the default VM directory

src/qt/qt_vmmanager_preferences.cpp

@@ -29,6 +29,7 @@ extern WindowsDarkModeFilter *vmm_dark_mode_filter;
 extern "C" {
 #include <86box/86box.h>
 #include <86box/config.h>
+#include <86box/plat.h>
 #include <86box/version.h>
 }
 
@@ -53,6 +54,7 @@ VMManagerPreferences::
     if (machinesRunning) {
         ui->systemDirectory->setEnabled(false);
         ui->dirSelectButton->setEnabled(false);
+        ui->pushButtonDefaultSystemDir->setEnabled(false);
         ui->dirSelectButton->setToolTip(tr("To change the system directory, stop all running machines."));
     }
 
@@ -97,6 +99,14 @@ VMManagerPreferences::chooseDirectoryLocation()
         ui->systemDirectory->setText(QDir::toNativeSeparators(directory));
 }
 
+void
+VMManagerPreferences::on_pushButtonDefaultSystemDir_released()
+{
+    char temp[1024];
+    plat_get_vmm_dir(temp, sizeof(temp));
+    ui->systemDirectory->setText(QDir::toNativeSeparators(QDir(temp).path()));
+}
+
 void
 VMManagerPreferences::on_pushButtonLanguage_released()
 {

src/qt/qt_vmmanager_preferences.hpp

@@ -34,6 +34,7 @@ private:
     QString                   settingsFile;
 private slots:
     void chooseDirectoryLocation();
+    void on_pushButtonDefaultSystemDir_released();
     void on_pushButtonLanguage_released();
 
 protected:

src/qt/qt_vmmanager_preferences.ui

@@ -56,6 +56,36 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_3">
+     <property name="leftMargin">
+      <number>0</number>
+     </property>
+     <property name="rightMargin">
+      <number>0</number>
+     </property>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="pushButtonDefaultSystemDir">
+       <property name="text">
+        <string>Default</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
    <item>
     <widget class="QLabel" name="labelLanguage">
      <property name="text">
@@ -170,6 +200,7 @@
  </widget>
  <tabstops>
   <tabstop>dirSelectButton</tabstop>
+  <tabstop>pushButtonDefaultSystemDir</tabstop>
   <tabstop>comboBoxLanguage</tabstop>
   <tabstop>pushButtonLanguage</tabstop>
   <tabstop>rememberSizePositionCheckBox</tabstop>