Keep end-of-block diamond glued to its content across page breaks#103
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\Exercise / \Theorem / \Example / \Problem all close with a \endblock diamond. Previously \leftbar always emitted two breakable medskips of trailing glue, so when the closing diamond followed inline content (review-mode solution, \Theorem proof, review-mode example, review-mode problem) it could land on a fresh page detached from the block above. Adds a \LeftbarOpen flag set by callers just before \leftbar when inline content follows in the same logical block; \leftbar then emits a single \nobreak\kern\medskipamount\nobreak instead of the breakable medskips, forbidding a page break between the bar and the diamond. Default tail behavior is unchanged.
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Summary
\Exercise/\Theorem/\Example/\Problemall close with an\endblockdiamond. Previously\leftbaralways emitted two breakable medskips of trailing glue, so when the closing diamond followed inline content (review-mode solution,\Theoremproof, review-mode example, review-mode problem) it could land on a fresh page detached from the block above.\LeftbarOpenflag set by callers just before\leftbarwhen inline content follows in the same logical block;\leftbarthen emits a single\nobreak\kern\medskipamount\nobreakinstead of the breakable medskips, forbidding a page break between the bar and the diamond.\leftbarcalls.