From df4862da84b9b8129eb53d455f196f28923fae5a Mon Sep 17 00:00:00 2001
From: ApolloF <98666317+ApolloF@users.noreply.github.com>
Date: Sun, 4 Oct 2026 21:30:41 +0200
Subject: [PATCH] Reject short-name aliases with trailing dots or spaces

---
 internal/paths/real.go      | 4 +++-
 internal/paths/real_test.go | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/internal/paths/real.go b/internal/paths/real.go
index 271b8c2..d874ec4 100644
--- a/internal/paths/real.go
+++ b/internal/paths/real.go
@@ -194,4 +194,6 @@ var shortNameForm = regexp.MustCompile(`~[0-9]+(\.[^.]*)?$`)
 // short name, which may stand for a folder of another name. Other names
 // with a "~" are fine: a real short name elsewhere is caught on disk by
 // CheckSyncable.
-func LooksShort(name string) bool { return shortNameForm.MatchString(name) }
+func LooksShort(name string) bool {
+	return shortNameForm.MatchString(strings.TrimRight(name, ". "))
+}
diff --git a/internal/paths/real_test.go b/internal/paths/real_test.go
index e7f2484..99145bb 100644
--- a/internal/paths/real_test.go
+++ b/internal/paths/real_test.go
@@ -88,7 +88,7 @@ func TestResolveShortNameForm(t *testing.T) {
 			t.Errorf("Resolve(home, %q) refused", rel)
 		}
 	}
-	for _, rel := range []string{"PROGRA~1", "MICROS~1.TXT", "Games/SAVEGA~12", "a~1."} {
+	for _, rel := range []string{"PROGRA~1", "MICROS~1.TXT", "Games/SAVEGA~12", "a~1.", "PROGRA~1 ", "PROGRA~1..", "MICROS~1.TXT."} {
 		if p, ok := Resolve(Home, rel); ok {
 			t.Errorf("Resolve(home, %q) = %q, want refused", rel, p)
 		}