When first implemented, backgrounds of the minimonth calendar inside the Calendar context were removed for high contrast OS themes and situations where the OS theme is different from a set Thunderbird theme (light mode or dark mode). We need to use a variant of one of the theme colors to set a background for the calendar. It should not be transparent in these contexts.
Bug 1805929 Comment 0 Edit History
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When first implemented, backgrounds of the minimonth calendar inside the Calendar context were removed for high contrast OS themes and situations where the OS theme is different from a set Thunderbird theme (light mode or dark mode). We need to use a variant of one of the theme colors to set a background for the calendar. It should not be transparent in these contexts. The minimonth calendar is used throughout the application in places where a background is definitely needed for each minimonth displayed. It should not be transparent.