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The persisted view stack was restored verbatim. RESTORABLE_VIEWS stopped the popup opening ONTO a view it will not re-render, but nothing kept such a view out of the stack, so Back could land on a screen whose content was deliberately never restored. No secret leaks -- those views are blank precisely because nothing is restored into them; this is a navigation defect. loadState() now truncates the stored stack at the first entry outside RESTORABLE_VIEWS, dropping it and everything above it. Truncating rather than splicing keeps the result a prefix of what was stored, so every surviving entry keeps the Back target it had; splicing would silently re-point the entry above the hole at a different screen. Filtering on load rather than on save is what makes it retroactive for stacks already in storage, and leaves the live in-session stack whole, which it should be. The general case where Back lands on a blank screen even for restorable views, because goBack() re-renders nothing, is separate and tracked at #268.
11 KiB
11 KiB