From 1a4c4b6cbe887886382ce389bf14b97010b88d9e Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 8 Sep 2022 16:39:06 +0200
Subject: Try to select an output with an unused index

---
 src/loginrpc.cpp | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/loginrpc.cpp b/src/loginrpc.cpp
index 1d36103..86bfe07 100644
--- a/src/loginrpc.cpp
+++ b/src/loginrpc.cpp
@@ -130,9 +130,33 @@ void LoginRpc::handleCommandV1(const QString &command)
             }
             // Either -1 if we didn't have a virtual one, or != 0 if xrandr setting failed
             // Now as fallback, try enabling a disconnected output only
-            if (ret != 0) {
+            if (ret != 0 && !disconnectedOutputs.isEmpty()) {
                 qDebug() << "Ret:" << ret << "- Trying to enable one disconnected output";
-                QString dis = disconnectedOutputs.first();
+                QRegularExpression re("\\d+$");
+                QString dis;
+                int used[10] = {};
+                for (QString c : connectedOutputs) {
+                    auto m = re.match(c);
+                    if (m.hasMatch()) {
+                        int i = m.captured().toInt();
+                        if (i >= 0 && i < 10) {
+                            used[i]++;
+                        }
+                    }
+                }
+                for (QString c : disconnectedOutputs) {
+                    auto m = re.match(c);
+                    if (m.hasMatch()) {
+                        int i = m.captured().toInt();
+                        if (i >= 0 && i < 10 && used[i] == 0) {
+                            dis = c;
+                            break;
+                        }
+                    }
+                }
+                if (dis.isEmpty()) {
+                    dis = disconnectedOutputs.first();
+                }
                 setMode.clear();
                 setMode << "--verbose" << "--output" << dis << "--mode" << name;
                 for (auto s : allOutputs) {
-- 
cgit v1.2.3-55-g7522