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config: recognize a blank comment line
Consider the comment line "#\n" to be a blank line, and print a blank line at that position when --withspaces is set.
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@ -1695,6 +1695,11 @@ static int _out_prefix_fn(const struct dm_config_node *cn, const char *line, voi
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if (cfg_def->comment) {
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int pos = 0;
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while (_copy_one_line(cfg_def->comment, commentline, &pos, strlen(cfg_def->comment))) {
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if ((commentline[0] == '#') && (strlen(commentline) == 1)) {
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if (!out->tree_spec->withspaces)
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continue;
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commentline[0] = '\0';
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}
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fprintf(out->fp, "%s# %s\n", line, commentline);
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/* withsummary prints only the first comment line. */
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if (!out->tree_spec->withcomments)
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