Remove the max half-open connections option from GUI

Its functionality was deprecated long ago.

src/base/bittorrent/session.cpp

@@ -287,7 +287,6 @@ Session::Session(QObject *parent)
     , m_announceIP(BITTORRENT_SESSION_KEY("AnnounceIP"))
     , m_isSuperSeedingEnabled(BITTORRENT_SESSION_KEY("SuperSeedingEnabled"), false)
     , m_maxConnections(BITTORRENT_SESSION_KEY("MaxConnections"), 500, lowerLimited(0, -1))
-    , m_maxHalfOpenConnections(BITTORRENT_SESSION_KEY("MaxHalfOpenConnections"), 20, lowerLimited(0, -1))
     , m_maxUploads(BITTORRENT_SESSION_KEY("MaxUploads"), -1, lowerLimited(0, -1))
     , m_maxConnectionsPerTorrent(BITTORRENT_SESSION_KEY("MaxConnectionsPerTorrent"), 100, lowerLimited(0, -1))
     , m_maxUploadsPerTorrent(BITTORRENT_SESSION_KEY("MaxUploadsPerTorrent"), -1, lowerLimited(0, -1))
@@ -3113,20 +3112,6 @@ void Session::setMaxConnections(int max)
     }
 }
 
-int Session::maxHalfOpenConnections() const
-{
-    return m_maxHalfOpenConnections;
-}
-
-void Session::setMaxHalfOpenConnections(int max)
-{
-    max = (max > 0) ? max : -1;
-    if (max != m_maxHalfOpenConnections) {
-        m_maxHalfOpenConnections = max;
-        configureDeferred();
-    }
-}
-
 int Session::maxUploads() const
 {
     return m_maxUploads;

src/base/bittorrent/session.h

@@ -413,8 +413,6 @@ namespace BitTorrent
         void setSuperSeedingEnabled(bool enabled);
         int maxConnections() const;
         void setMaxConnections(int max);
-        int maxHalfOpenConnections() const;
-        void setMaxHalfOpenConnections(int max);
         int maxConnectionsPerTorrent() const;
         void setMaxConnectionsPerTorrent(int max);
         int maxUploads() const;
@@ -660,7 +658,6 @@ namespace BitTorrent
         CachedSettingValue<QString> m_announceIP;
         CachedSettingValue<bool> m_isSuperSeedingEnabled;
         CachedSettingValue<int> m_maxConnections;
-        CachedSettingValue<int> m_maxHalfOpenConnections;
         CachedSettingValue<int> m_maxUploads;
         CachedSettingValue<int> m_maxConnectionsPerTorrent;
         CachedSettingValue<int> m_maxUploadsPerTorrent;

src/gui/advancedsettings.cpp

@@ -102,7 +102,6 @@ enum AdvSettingsRows
     SEND_BUF_LOW_WATERMARK,
     SEND_BUF_WATERMARK_FACTOR,
     // ports
-    MAX_HALF_OPEN,
     OUTGOING_PORT_MIN,
     OUTGOING_PORT_MAX,
     UTP_MIX_MODE,
@@ -189,8 +188,6 @@ void AdvancedSettings::saveAdvancedSettings()
     // Peer resolution
     pref->resolvePeerCountries(checkBoxResolveCountries.isChecked());
     pref->resolvePeerHostNames(checkBoxResolveHosts.isChecked());
-    // Max Half-Open connections
-    session->setMaxHalfOpenConnections(spinBoxMaxHalfOpen.value());
     // Super seeding
     session->setSuperSeedingEnabled(checkBoxSuperSeeding.isChecked());
     // Network interface
@@ -439,11 +436,6 @@ void AdvancedSettings::loadAdvancedSettings()
     // Resolve peer hosts
     checkBoxResolveHosts.setChecked(pref->resolvePeerHostNames());
     addRow(RESOLVE_HOSTS, tr("Resolve peer host names"), &checkBoxResolveHosts);
-    // Max Half Open connections
-    spinBoxMaxHalfOpen.setMinimum(0);
-    spinBoxMaxHalfOpen.setMaximum(99999);
-    spinBoxMaxHalfOpen.setValue(session->maxHalfOpenConnections());
-    addRow(MAX_HALF_OPEN, tr("Maximum number of half-open connections [0: Unlimited]"), &spinBoxMaxHalfOpen);
     // Super seeding
     checkBoxSuperSeeding.setChecked(session->isSuperSeedingEnabled());
     addRow(SUPER_SEEDING, (tr("Strict super seeding") + ' ' + makeLink("https://www.libtorrent.org/reference-Settings.html#strict_super_seeding", "(?)"))

src/gui/advancedsettings.h

@@ -59,7 +59,7 @@ private:
     template <typename T> void addRow(int row, const QString &text, T *widget);
 
     QLabel labelQbtLink, labelLibtorrentLink;
-    QSpinBox spinBoxAsyncIOThreads, spinBoxCheckingMemUsage, spinBoxCache, spinBoxSaveResumeDataInterval, spinBoxOutgoingPortsMin, spinBoxOutgoingPortsMax, spinBoxListRefresh, spinBoxMaxHalfOpen,
+    QSpinBox spinBoxAsyncIOThreads, spinBoxCheckingMemUsage, spinBoxCache, spinBoxSaveResumeDataInterval, spinBoxOutgoingPortsMin, spinBoxOutgoingPortsMax, spinBoxListRefresh,
              spinBoxTrackerPort, spinBoxCacheTTL, spinBoxSendBufferWatermark, spinBoxSendBufferLowWatermark,
              spinBoxSendBufferWatermarkFactor, spinBoxSavePathHistoryLength;
     QCheckBox checkBoxOsCache, checkBoxRecheckCompleted, checkBoxResolveCountries, checkBoxResolveHosts, checkBoxSuperSeeding,