Cleanup: expand on why the extension isn't replaced for blend-file save

source/blender/windowmanager/intern/wm_files.cc

@@ -3265,8 +3265,9 @@ static bool wm_save_mainfile_check(bContext * /*C*/, wmOperator *op)
   char filepath[FILE_MAX];
   RNA_string_get(op->ptr, "filepath", filepath);
   if (!BKE_blendfile_extension_check(filepath)) {
-    /* some users would prefer BLI_path_extension_replace(),
-     * we keep getting nitpicking bug reports about this - campbell */
+    /* NOTE(@ideasman42): some users would prefer #BLI_path_extension_replace(),
+     * we have had some nitpicking bug reports about this.
+     * Always adding the extension as users may use '.' as part of the file-name. */
     BLI_path_extension_ensure(filepath, FILE_MAX, ".blend");
     RNA_string_set(op->ptr, "filepath", filepath);
     return true;