apply.c:update_pre_post_images(): the preimage can be truncated
51667147 (apply: Allow blank context lines to match beyond EOF, 2010-03-06) and then later 0c3ef984 (apply: Allow blank *trailing* context lines to match beyond EOF, 2010-04-08) taught "git apply" to trim new blank lines at the end in the patch text when matching the contents being patched and the preimage recorded in the patch, under --whitespace=fix mode. When a preimage is modified to match the current contents in preparation for such a "fixed" patch application, the context lines in the postimage must be updated to match (otherwise, it would reintroduce whitespace breakages), and update_pre_post_images() function is responsible for doing this. However, this function was not updated to take into account a case where the removal of trailing blank lines reduces the number of lines in the preimage, and triggered an assertion error. The logic to fix the postimage by copying the corrected context lines from the preimage was not prepared to handle this case, either, but it was protected by the assert() and only got exposed when the assertion is corrected. Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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