File 4292-Improve-observer-node-list-menu-in-distribution-edge.patch of Package erlang

From e26584bc05f8a9784c531599fd0a6bae85ad1c49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20G=C3=B6m=C3=B6ri?= <gomoripeti@gmail.com>
Date: Mon, 30 May 2022 01:38:11 +0200
Subject: [PATCH 2/2] Improve observer node list menu in distribution edge
 cases

- Always include current node. If dist_listen is false it won't show up
in epdm names
- If the default epmd module erl_epmd is used and erl_epmd_port is set
to `DistPort' then it is only possible to connect to the node listening
on DistPort (if any), so exclude other nodes registered in EPMD
---
 lib/observer/src/observer_wx.erl | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/lib/observer/src/observer_wx.erl b/lib/observer/src/observer_wx.erl
index dea7e07db0..321f189fc9 100644
--- a/lib/observer/src/observer_wx.erl
+++ b/lib/observer/src/observer_wx.erl
@@ -752,7 +752,7 @@ get_nodes() ->
                         {ok, Names} -> epmd_nodes(Names)
                     end
                     ++
-                    nodes(connected)
+                    [node() | nodes(connected)]
 	     end,
     Nodes = lists:usort(Nodes0),
     WarningText = "WARNING: connecting to non-erlang nodes may crash them",
@@ -764,7 +764,28 @@ get_nodes() ->
 		    end, {1, []}, Nodes),
     {Nodes, lists:reverse(Menues)}.
 
-epmd_nodes(Names) ->
+%% see erl_epmd:(listen_)port_please/2
+erl_dist_port() ->
+    try
+        erl_epmd = net_kernel:epmd_module(),
+        {ok, [[StringPort]]} = init:get_argument(erl_epmd_port),
+        list_to_integer(StringPort)
+    catch
+        _:_ ->
+            undefined
+    end.
+
+%% If the default epmd module erl_epmd is used and erl_epmd_port is
+%% set to `DistPort' then it is only possible to connect to the node
+%% listening on DistPort (if any), so exclude other nodes registered
+%% in EPMD
+epmd_nodes(Names0) ->
+    Names = case erl_dist_port() of
+                undefined ->
+                    Names0;
+                DistPort ->
+                    [NP || NP = {_, Port} <- Names0, Port =:= DistPort]
+            end,
     [_, Host] = string:lexemes(atom_to_list(node()),"@"),
     [list_to_atom(Name ++ [$@|Host]) || {Name, _} <- Names].
 
-- 
2.35.3