add an extra space for padding on the first line

examples/no-indent.stdout

@@ -1,21 +1,21 @@
-1:mainno_indent::hierarchical-example version=0.1
-1:main  no_indent::server host="localhost", port=8080
-1:main      Xms INFO no_indent starting
-1:main      Xms INFO no_indent listening
-1:main    no_indent::conn peer_addr="82.9.9.9", port=42381
-1:main        Xms DEBUG no_indent connected
-1:main        Xms DEBUG no_indent message received, length=2
-1:main    no_indent::conn peer_addr="8.8.8.8", port=18230
-1:main        Xms DEBUG no_indent connected
-1:main    no_indent::foomp 42 <- format string, normal_var=43
-1:main        Xms ERROR no_indent hello
-1:main    no_indent::conn peer_addr="82.9.9.9", port=42381
-1:main        Xms WARN no_indent weak encryption requested, algo="xor"
-1:main        Xms DEBUG no_indent response sent, length=8
-1:main        Xms DEBUG no_indent disconnected
-1:main    no_indent::conn peer_addr="8.8.8.8", port=18230
-1:main        Xms DEBUG no_indent message received, length=5
-1:main        Xms DEBUG no_indent response sent, length=8
-1:main        Xms DEBUG no_indent disconnected
-1:main      Xs  WARN no_indent internal error
-1:main      Xs  INFO no_indent exit
+1:main no_indent::hierarchical-example version=0.1
+1:main   no_indent::server host="localhost", port=8080
+1:main       Xms INFO no_indent starting
+1:main       Xms INFO no_indent listening
+1:main     no_indent::conn peer_addr="82.9.9.9", port=42381
+1:main         Xms DEBUG no_indent connected
+1:main         Xms DEBUG no_indent message received, length=2
+1:main     no_indent::conn peer_addr="8.8.8.8", port=18230
+1:main         Xms DEBUG no_indent connected
+1:main     no_indent::foomp 42 <- format string, normal_var=43
+1:main         Xms ERROR no_indent hello
+1:main     no_indent::conn peer_addr="82.9.9.9", port=42381
+1:main         Xms WARN no_indent weak encryption requested, algo="xor"
+1:main         Xms DEBUG no_indent response sent, length=8
+1:main         Xms DEBUG no_indent disconnected
+1:main     no_indent::conn peer_addr="8.8.8.8", port=18230
+1:main         Xms DEBUG no_indent message received, length=5
+1:main         Xms DEBUG no_indent response sent, length=8
+1:main         Xms DEBUG no_indent disconnected
+1:main       Xs  WARN no_indent internal error
+1:main       Xs  INFO no_indent exit

src/format.rs

@@ -418,6 +418,7 @@ fn indent_block(
         let indent_str = String::from(" ").repeat(indent_spaces);
         for line in lines {
             buf.push_str(prefix);
+            buf.push(' ');
             buf.push_str(&indent_str);
             buf.push_str(line);
             buf.push('\n');