Add option to reuse last window size when letterboxing is enabled
From the 20230718 applications team meeting: > @donuts: the maybe-slightly-controversial thing I'd also like to propose is: additional option in preferences for new windows to open in the last used letterbox size, or to select a default size, or both because the first thing I see _everyone_ do when they open a new window is to manually change the size anyway My preference would be a "Remember last window size" to be shown and honored __only when letterboxing is enabled__. This should not be seen as a substitute of the initial window machinery, but a as more user-friendly way to size windows __when user is protected by letterboxing__. /cc @ruihildt, @thorin
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