Fix bugzilla issue 24871 - DDoc strips indent in triple slash comments

Removes code in the lexer responsible for removing leading spaces in
triple slash doc comments.

This affects the test file for issue 14413; two more spaces appear, but
they are not significant in the HTML output.

compiler/src/dmd/lexer.d

@@ -3441,15 +3441,10 @@ class Lexer
             if (*q != ct)
                 break;
         }
-        /* Remove leading spaces until start of the comment
+        /* Remove leading line feed
          */
         int linestart = 0;
-        if (ct == '/')
-        {
-            while (q < qend && (*q == ' ' || *q == '\t'))
-                ++q;
-        }
-        else if (q < qend)
+        if (ct != '/' && q < qend)
         {
             if (*q == '\r')
             {

compiler/test/compilable/ddoc24871.d

@@ -0,0 +1,19 @@
+// PERMUTE_ARGS:
+// REQUIRED_ARGS: -D -Dd${RESULTS_DIR}/compilable -o-
+// POST_SCRIPT: compilable/extra-files/ddocAny-postscript.sh
+import std.stdio;
+
+/// Example
+/// ---
+/// void main() {
+/// 	foreach (i; 0..10) {
+/// 		writeln("Hello, world!");
+/// 	}
+/// }
+/// ---
+void main() {
+
+    writeln("Hello, World!");
+
+}
+

compiler/test/compilable/extra-files/ddoc14413.html

@@ -542,8 +542,8 @@ <h4>Declaration</h4>
   <div class="ddoc_summary">
   <p class="para">
     This should
-be one
-paragraph.
+ be one
+ paragraph.
 
   </p>
 </div>