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undo: when redoing, don't try to find a line number that might not exist
This fixes https://savannah.gnu.org/bugs/?53272.
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@ -866,7 +866,7 @@ void do_redo(void)
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return;
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}
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f = fsfromline(u->mark_begin_lineno);
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f = fsfromline(u->type == INSERT ? 1 : u->mark_begin_lineno);
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if (!f)
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return;
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