This is a maintenance release. The following items were fixed and/or added:
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VMM: reset the TSC on VM reset to work around a Windows bug (bug #16643)
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Audio: fixed memory leak when enabled with VRDP connections (5.1.24 regression; bug #16928)
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Audio: fixed creation of too many sound sinks on Linux hosts when using the PulseAudio backend (bug #16938)
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Audio: implemented record gain registers for AC'97 emulation; those are needed for newer Ubuntu guests which rely on those when controlling gain and muting the recording (capturing) levels
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Storage: fixed hang when using the emulated NVMe controller with the SPDK (bug #16945)
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Mouse: double click was not working with a precision touchpad (bug #14632)
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Linux hosts: properly bring up host-only network interfaces with iproute (5.1.24 regression; bug #16911)
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Linux hosts: provide Python 3 libraries for deb/rpm packages
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Windows hosts: make it possible to use host-only networking without having bridged networking installed
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Windows guests: fixed automatic logons for Vista and newer Windows guests (5.1.24 regression; bug #16921)