4319c211dc
No user visible changes expected. This is needed for the asset shelf (#104831), so that the user can resize the asset shelf region, but it's ensured to always be snapped to a multiple of the row height (which can change over redraws). Before this, `RGN_FLAG_DYNAMIC_SIZE` would have to be set so that regions can control their own size in the `ARegionType::layout()` callback. But this would also disable resizing the region by the user. Tagging regions as being dynamically sized and disabling user resizing are now two separate options/flags. Included changes: - Rename `RGN_FLAG_PREFSIZE_OR_HIDDEN` to `RGN_FLAG_NO_USER_RESIZE` and make that generally disable user resizing like `RGN_FLAG_DYNAMIC_SIZE` used to, so that it can be used for more than just the properties editor tabs region. - Ensure regions that relied on the previous `RGN_FLAG_DYNAMIC_SIZE` behavior that disallowed user resizing have the `RGN_FLAG_NO_USER_RESIZE` flag set too now. - Versioning to ensure the previous point for old files. - Update comments.
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