desktop: do not suggest file names starting with "<" (#8103)

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/platform/Files.desktop.kt

@@ -116,7 +116,7 @@ private fun fileFilterDescription(input: String): String = when(input) {
   else -> ""
 }
 
-internal fun saveDialogFileName(name: String): String = name.trimStart('.').ifEmpty { name }
+internal fun saveDialogFileName(name: String): String = name.trimStart('.', '<').ifEmpty { name }
 
 actual fun URI.inputStream(): InputStream? = toFile().inputStream()
 actual fun URI.outputStream(): OutputStream = toFile().outputStream()

apps/multiplatform/common/src/desktopTest/kotlin/chat/simplex/app/SaveDialogFileNameTest.kt

@@ -6,9 +6,10 @@ import kotlin.test.assertEquals
 
 class SaveDialogFileNameTest {
   @Test
-  fun testLeadingDotsRemoved() {
+  fun testLeadingDotsAndLessThanSignsRemoved() {
     assertEquals("bashrc", saveDialogFileName(".bashrc"))
     assertEquals("hidden.txt", saveDialogFileName("..hidden.txt"))
+    assertEquals("notes.txt", saveDialogFileName("<notes.txt"))
   }
 
   @Test