improve mixpanel usage statistics (#2238)

Other changes:
- Always display first start dialog if privacy options are unset (e.g. if the user closed GPT4All without selecting them)
- LocalDocs scanQueue is now always deferred
- Fix a potential crash in magic_match
- LocalDocs indexing is now started after the first start dialog is dismissed so usage stats are included

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-chat/mysettings.cpp

@@ -910,15 +910,23 @@ bool MySettings::networkIsActive() const
     return setting.value("network/isActive", default_networkIsActive).toBool();
 }
 
+bool MySettings::isNetworkIsActiveSet() const
+{
+    QSettings setting;
+    setting.sync();
+    return setting.value("network/isActive").isValid();
+}
+
 void MySettings::setNetworkIsActive(bool b)
 {
-    if (networkIsActive() == b)
-        return;
-
     QSettings setting;
-    setting.setValue("network/isActive", b);
     setting.sync();
-    emit networkIsActiveChanged();
+    auto cur = setting.value("network/isActive");
+    if (!cur.isValid() || cur.toBool() != b) {
+        setting.setValue("network/isActive", b);
+        setting.sync();
+        emit networkIsActiveChanged();
+    }
 }
 
 bool MySettings::networkUsageStatsActive() const
@@ -928,13 +936,21 @@ bool MySettings::networkUsageStatsActive() const
     return setting.value("network/usageStatsActive", default_networkUsageStatsActive).toBool();
 }
 
+bool MySettings::isNetworkUsageStatsActiveSet() const
+{
+    QSettings setting;
+    setting.sync();
+    return setting.value("network/usageStatsActive").isValid();
+}
+
 void MySettings::setNetworkUsageStatsActive(bool b)
 {
-    if (networkUsageStatsActive() == b)
-        return;
-
     QSettings setting;
-    setting.setValue("network/usageStatsActive", b);
     setting.sync();
-    emit networkUsageStatsActiveChanged();
+    auto cur = setting.value("network/usageStatsActive");
+    if (!cur.isValid() || cur.toBool() != b) {
+        setting.setValue("network/usageStatsActive", b);
+        setting.sync();
+        emit networkUsageStatsActiveChanged();
+    }
 }