This is a maintenance release. The following items were fixed and/or added:
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VMM: reverted to the old I/O-APIC code for now to fix certain regressions with 5.0.22 (bug #15529). This means that the networking performance with certain guests will drop to the 5.0.20 level (bug #15295). One workaround is to disable GRO for Linux guests
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Main: when taking a screenshot, don't save garbage for blanked screens
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NAT: correctly parse resolv.conf file with multiple separators (5.0.22 regression)
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Storage: fixed a possible corruption of stream optimized VMDK images from VMware when opened in read/write mode for the first time
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ACPI: notify the guest when the battery / AC state changes instead of relying on guest polling
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Linux hosts: fixed VERR_VMM_SET_JMP_ABORTED_RESUME Guru Meditations on hosts with Linux 4.6 or later (bug #15439)
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Solaris hosts: make the GUI work on Solaris 10 again (bug #15549)