kinow commented on a change in pull request #297:
URL: https://github.com/apache/commons-io/pull/297#discussion_r744176872
##########
File path: src/main/java/org/apache/commons/io/FilenameUtils.java
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@@ -201,7 +201,7 @@ public static String concat(final String basePath, final
String fullFileNameToAd
if (prefix < 0) {
return null;
}
- if (prefix > 0) {
+ if (prefix > 0 && !fullFileNameToAdd.isEmpty() && '~' !=
(fullFileNameToAdd.charAt(0))) {
Review comment:
Would this work too?
```suggestion
if (prefix > 0 && !fullFileNameToAdd.startsWith("~")) {
```
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