Fix tests. Fix bug with hidden lines

Author: pikinier20

project/scripts/cmdScaladocTests

@@ -31,6 +31,8 @@ dist/target/pack/bin/scaladoc \
   -Ygenerate-inkuire \
   "-skip-by-id:scala.runtime.stdLibPatches" \
   "-skip-by-id:scala.runtime.MatchCase" \
+  "-siteroot scaladoc-testcases/docs" \
+  "-snippet-compiler=scaladoc-testcases/docs=compile" \
   -project-footer "Copyright (c) 2002-2021, LAMP/EPFL" \
   -author -groups -revision master -project-version "${DOTTY_BOOTSTRAPPED_VERSION}" \
   out/bootstrap/scaladoc-testcases/scala-"${DOTTY_NONBOOTSTRAPPED_VERSION}"/classes > "$tmp" 2>&1 || echo "generated testcases project with scripts"

scaladoc/src/dotty/tools/scaladoc/tasty/comments/markdown/SnippetRenderer.scala

@@ -65,7 +65,7 @@ object SnippetRenderer:
         if elem.content.startsWith(currPrefix) then currPrefix else elem.content.takeWhile(_ == ' ')
       }
       snippetLines.map { line =>
-        if line.classes.contains("hideable") then line
+        if line.classes.contains("hideable") || maxCommonIndent.size == 0 then line
         else line.copy(content = span(cls := "hideable")(maxCommonIndent).toString + line.content.stripPrefix(maxCommonIndent))
       }
     }.getOrElse(snippetLines)