save: Gracefully handle interruptions#578
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A save firing mid-boot/shutdown can capture zero panes. That empty dump still 'differs' from the last good save, so 'last' gets repointed to it; restore then reads an empty file and kills session 0. Skip the repoint when the dump has no 'pane' lines. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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save: don't repoint 'last' to a paneless dump
A save firing mid-boot/shutdown can capture zero panes. That empty dump still 'differs' from the last good save, so 'last' gets repointed to it; restore then reads an empty file and kills session 0. Skip the repoint when the dump has no 'pane' lines.