Temporarily mutes all notification banners, including CRITICAL ones, for a chosen number of minutes. Start it reactively from a control on an ill-timed banner, or proactively from a persistent panel indicator. Missed notifications accumulate in GNOME's queue and pop up as a burst when the timer ends or you end it early. Suppression uses MessageTray's own bannerBlocked, guarded against GNOME's panel logic that would otherwise lift it. Works on GNOME 45-50.
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Mute Banners Timer