The macOS menu bar takes Cmd+A, Cmd+C, Cmd+X, Cmd+V, Cmd+Z and Cmd+Shift+Z
before the window sees them, so in a panel, dialog or search field they ran
the document's commands: Select All selected every frame, Paste pasted into
the layout, Undo undid the last document change.
While a text field has keyboard focus, these Edit items now act on the field,
whether chosen by shortcut or from the menu: Select All, Undo and Redo reach
it as their keys, Copy and Cut as clipboard events, and Paste asks the
window for the system clipboard. The items stay enabled for the field even
when the document has nothing to copy or undo. With no field focused, and
for every other item, the menu works as before.
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