imp - Transparency is checked again

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We've restored the value checks for transparency.

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Type: imp
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

VisualCard.Calendar/Parsers/VCalendarParserTools.cs

@@ -311,7 +311,7 @@ internal static (PartType type, object enumeration, Type? enumType, Func<string,
                 VCalendarConstants._statusSpecifier => (PartType.Strings, CalendarStringsEnum.Status, null, null, "", "", "text", [], allowedStatuses),
                 VCalendarConstants._summarySpecifier => (PartType.Strings, CalendarStringsEnum.Summary, null, null, "", "", "text", [], []),
                 VCalendarConstants._descriptionSpecifier => (PartType.Strings, CalendarStringsEnum.Description, null, null, "", "", "text", [], []),
-                VCalendarConstants._transparencySpecifier => (PartType.Strings, CalendarStringsEnum.Transparency, null, null, "", "", "text", [], []),
+                VCalendarConstants._transparencySpecifier => (PartType.Strings, CalendarStringsEnum.Transparency, null, null, "", "", calendarVersion.Major == 2 ? "text" : "integer", [], calendarVersion.Major == 2 ? ["TRANSPARENT", "OPAQUE"] : []),
                 VCalendarConstants._actionSpecifier => (PartType.Strings, CalendarStringsEnum.Action, null, null, "", "", "text", [], []),
                 VCalendarConstants._triggerSpecifier => (PartType.Strings, CalendarStringsEnum.Trigger, null, null, "", "", "duration", [], []),
                 VCalendarConstants._tzidSpecifier => (PartType.Strings, CalendarStringsEnum.TimeZoneId, null, null, "", "", "text", [], []),