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CORE-20021, CORE-20023, CORE-20037 Complements commits1786a68256(#7757) andd1aa59982d(#7921) - When starting eventvwr, the details buttons are disabled and the fields are empty. - During events enumeration, i.e. when refreshing the events list, the Previous/Next navigation arrow buttons are disabled. They get re-enabled once enumeration is done. No default event item is auto-selected at first. - When the user selects an item, the details fields are filled (and the Copy button is enabled; the Byte/Word mode buttons are enabled only if the selected event has associated data). - When changing the current filter via the TreeView, the events list is refreshed, but also the event details fields are emptied and buttons are disabled. The navigation arrows are re-enabled once enumeration is finished, but the details fields remain empty until an event is selected. - Pressing the Previous/Next buttons just after the events list refresh (when no item is selected), automatically selects respectively the last/the first event in the list. The rationale for this behaviour is the following: in this situation, no item is selected, so it is as if the "current" item is at the same time, at the top and at the end (i.e. at the borders) of the list. - Temporary HACK: When disabling the navigation arrows, this is usually because the events list is being refreshed, so we loose access to the event's data and we cannot use the bytes/words mode buttons anymore.