a95a63b753
## Summary Fixes a crash (load access fault) when opening EPUB chapters whose first text block exceeds 750 words. ## Changes * **Crash fix (`addLineToPage`)**: Added a null guard for `currentPage`. If `makePages()` hasn't run yet (which can happen when the first block triggers the "text block too long" split path), the page is now created on demand. * **Layout fix (`characterData`)**: The early-split path previously used `viewportWidth`, ignoring CSS margins and padding. It now computes `effectiveWidth` using `totalHorizontalInset()`, consistent with `makePages()`. ## Additional Context * Crash signature: `MCAUSE=0x5` (load access fault), `A0=0x0` (`Page*` null), `MTVAL=0x4 / 0x8` (offsets into `Page::elements`). * Confirmed in two user reports reported in #1328 * Tested on PR #1357 (not on `master`). --- ### AI Usage While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it helps set the right context for reviewers. Did you use AI tools to help write this code? _**< PARTIALLY >**_
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