Without this patch compiling SeaMonkey 2.53 with VS2019 is not possible. Compiling 2.57 works only by chance. patches for the official gitlab repos only.
Bug 1602259 Comment 0 Edit History
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Without this patch compiling SeaMonkey 2.53 with VS2019 is not possible. Compiling 2.57 works only by chance. patches for the official gitlab repos only. Also drop support for VS2015. Old and no longer tested by us.