properly fix screenshare portal

etc/jay-portals.conf

@@ -3,4 +3,4 @@ default=gtk
 org.freedesktop.impl.portal.ScreenCast=jay
 org.freedesktop.impl.portal.RemoteDesktop=jay
 org.freedesktop.impl.portal.Inhibit=none
-org.freedesktop.impl.portal.FileChooser=gtk4
+org.freedesktop.impl.portal.FileChooser=gtk

src/portal/ptl_display.rs

@@ -286,17 +286,28 @@ impl UsrJayOutputOwner for PortalOutput {
 
 impl UsrWlOutputOwner for PortalOutput {}
 
-async fn maybe_add_display(state: &Rc<PortalState>, name: &str) {
+fn parse_display_name(name: &str) -> Option<u32> {
     let tail = match name.strip_prefix("wayland-") {
         Some(t) => t,
-        _ => return,
+        _ => return None,
     };
     let head = match tail.strip_suffix(".jay") {
         Some(h) => h,
-        _ => return,
+        _ => tail,
     };
     let num = match u32::from_str(head) {
         Ok(n) => n,
+        _ => return None,
+    };
+    if !(1..1000).contains(&num) {
+        return None;
+    }
+    Some(num)
+}
+
+async fn maybe_add_display(state: &Rc<PortalState>, name: &str) {
+    let num = match parse_display_name(name) {
+        Some(n) => n,
         _ => return,
     };
     let path = format!("{}/{}", state.xrd, name);