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8e7446b3cb
Previously b_signcols was invalidated whenever a sign was added/removed or when a buffer line was added/removed. This change introduces a sentinel linenr_T into the buffer state which is a line number used to determine the signcolumn. With this information, we can invalidate the signcolumn less often. Now the signcolumn is only invalidated when a sign or line at the sentinel line number is removed.