Split long --help output lines

Looks better aligned.

Change-Id: I2cab4c1382767b2e2489703bea65bd01c71d2ad6
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/libs/extensionsystem/pluginmanager.cpp

@@ -686,7 +686,12 @@ static inline void formatOption(QTextStream &str,
         str << " <" << parm << '>';
         remainingIndent -= 3 + parm.size();
     }
-    indent(str, qMax(1, remainingIndent));
+    if (remainingIndent >= 1) {
+        indent(str, remainingIndent);
+    } else {
+        str << '\n';
+        indent(str, descriptionIndentation);
+    }
     str << description << '\n';
 }