hMailServer 6.2.16: an error dialog on closing the Ctrl+K settings palette
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The Control Panel raised an error dialog every time you dismissed the Ctrl+K settings palette (#21, reported by grumpymojo). It was present in both 6.2.14 and 6.2.15, and because choosing a result and pressing Esc both went through the same path, it appeared on essentially every search rather than on any particular search term or configuration.
What the upgrade involved
No server change and no database change. Schema version stays at 6005. Anyone coming from 6.2.14 or earlier should read the 6.2.15 notes as well, because everything in them applies here.
Fixed
Closing the palette moves the focus away, which raised the deactivation handler while the close was still in progress, and that handler closed the window a second time. WPF refuses that outright:
System.InvalidOperationException: Cannot set Visibility to Visible or call Show, ShowDialog, Close, or WindowInteropHelper.EnsureHandle while a Window is closing.The deactivation handler now closes the palette only when a close is not already under way. Nothing was lost to this defect. The navigation had already happened by the time the dialog appeared, so no setting was misapplied. It was noise in the one feature added to make settings easier to find.
Still open at this release
Discussion #18, the stall after 354 when relaying from Postfix or Proxmox Mail Gateway, remained open and unreproduced. 6.2.15 added debug logging to the SMTP DATA path that distinguishes the three candidate stages, and that log is what will identify the cause. Tracked in #20.
Validated by the full regression suite: 1040 of 1040 passing, zero failures. The download is hMailServer-6.2.16-x64.exe.
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