net-p2p/qbittorrent: Adjust default settings when using libtorrent-ra…

…sterbar 2.x

* Disable memmory mapped file handling and use "POSIX-compliant"
* Backport commit 8bcac1bed28f93c0712e915f43294b1e5fd03659 which
  reduces FilePoolSize
* Change status to experimental

This change only applies to new installs, if you have a configuration
already you need to apply these changes by hand

References:
qbittorrent/qBittorrent@8bcac1b
arvidn/libtorrent#6667 (comment)

PR:		270765
Reviewed by:	yuri (previous revision)

net-p2p/qbittorrent/Makefile

@@ -54,7 +54,7 @@ OPTIONS_DEFAULT=		DBUS LIBTORRENT1
 
 LIBTORRENT_DESC=	libtorrent version number to use
 LIBTORRENT1_DESC=	Version 1.x (default)
-LIBTORRENT2_DESC=	Version 2.x (unstable, has memory issues)
+LIBTORRENT2_DESC=	Version 2.x (experimental)
 
 DEBUG_CONFIGURE_ENABLE=	debug
 DBUS_CONFIGURE_ENABLE=	qt-dbus
@@ -64,6 +64,7 @@ LIBTORRENT1_BUILD_DEPENDS=	libtorrent-rasterbar>0:net-p2p/libtorrent-rasterbar
 LIBTORRENT1_RUN_DEPENDS=	libtorrent-rasterbar>0:net-p2p/libtorrent-rasterbar
 LIBTORRENT2_BUILD_DEPENDS=	libtorrent-rasterbar2>0:net-p2p/libtorrent-rasterbar2
 LIBTORRENT2_RUN_DEPENDS=	libtorrent-rasterbar2>0:net-p2p/libtorrent-rasterbar2
+LIBTORRENT2_EXTRA_PATCHES=	${FILESDIR}/extrapatch-libtorrent-rasterbar2-settings
 
 PYTHON_DESC=		Install Python to support some plugin functionality
 PYTHON_USES=		python:3.6+,run

net-p2p/qbittorrent/files/extrapatch-libtorrent-rasterbar2-settings

@@ -0,0 +1,17 @@
+--- src/base/bittorrent/sessionimpl.cpp.orig	2023-02-27 22:40:57 UTC
++++ src/base/bittorrent/sessionimpl.cpp
+@@ -396,12 +396,12 @@ SessionImpl::SessionImpl(QObject *parent)
+     , m_announceToAllTiers(BITTORRENT_SESSION_KEY(u"AnnounceToAllTiers"_qs), true)
+     , m_asyncIOThreads(BITTORRENT_SESSION_KEY(u"AsyncIOThreadsCount"_qs), 10)
+     , m_hashingThreads(BITTORRENT_SESSION_KEY(u"HashingThreadsCount"_qs), 1)
+-    , m_filePoolSize(BITTORRENT_SESSION_KEY(u"FilePoolSize"_qs), 5000)
++    , m_filePoolSize(BITTORRENT_SESSION_KEY(u"FilePoolSize"_qs), 500)
+     , m_checkingMemUsage(BITTORRENT_SESSION_KEY(u"CheckingMemUsageSize"_qs), 32)
+     , m_diskCacheSize(BITTORRENT_SESSION_KEY(u"DiskCacheSize"_qs), -1)
+     , m_diskCacheTTL(BITTORRENT_SESSION_KEY(u"DiskCacheTTL"_qs), 60)
+     , m_diskQueueSize(BITTORRENT_SESSION_KEY(u"DiskQueueSize"_qs), (1024 * 1024))
+-    , m_diskIOType(BITTORRENT_SESSION_KEY(u"DiskIOType"_qs), DiskIOType::Default)
++    , m_diskIOType(BITTORRENT_SESSION_KEY(u"DiskIOType"_qs), DiskIOType::Posix)
+     , m_diskIOReadMode(BITTORRENT_SESSION_KEY(u"DiskIOReadMode"_qs), DiskIOReadMode::EnableOSCache)
+     , m_diskIOWriteMode(BITTORRENT_SESSION_KEY(u"DiskIOWriteMode"_qs), DiskIOWriteMode::EnableOSCache)
+ #ifdef Q_OS_WIN