From 5fe6de699ca0cad9934197b317c93bcc4f41b117 Mon Sep 17 00:00:00 2001
From: David Redondo <kde@david-redondo.de>
Date: Wed, 7 Jul 2021 13:50:02 +0200
Subject: [PATCH] Handle when a xdg-toplevel changes its min or max size

We previously never emitted maximiziableChanged() meaning we never
synced the state to the decoration.
BUG:439578
---
 src/xdgshellclient.cpp | 14 ++++++++++++++
 src/xdgshellclient.h   |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/src/xdgshellclient.cpp b/src/xdgshellclient.cpp
index d21d108289..c0053b4167 100644
--- a/src/xdgshellclient.cpp
+++ b/src/xdgshellclient.cpp
@@ -393,6 +393,10 @@ XdgToplevelClient::XdgToplevelClient(XdgToplevelInterface *shellSurface)
             this, &XdgToplevelClient::initialize);
     connect(shellSurface, &XdgToplevelInterface::destroyed,
             this, &XdgToplevelClient::destroyClient);
+    connect(shellSurface, &XdgToplevelInterface::maximumSizeChanged,
+            this, &XdgToplevelClient::handleMaximumSizeChanged);
+    connect(shellSurface, &XdgToplevelInterface::minimumSizeChanged,
+            this, &XdgToplevelClient::handleMinimumSizeChanged);
     connect(shellSurface->shell(), &XdgShellInterface::pingTimeout,
             this, &XdgToplevelClient::handlePingTimeout);
     connect(shellSurface->shell(), &XdgShellInterface::pingDelayed,
@@ -1148,6 +1152,16 @@ void XdgToplevelClient::handlePongReceived(quint32 serial)
     setUnresponsive(false);
 }
 
+void XdgToplevelClient::handleMaximumSizeChanged()
+{
+    Q_EMIT maximizeableChanged(isMaximizable());
+}
+
+void XdgToplevelClient::handleMinimumSizeChanged()
+{
+    Q_EMIT maximizeableChanged(isMaximizable());
+}
+
 void XdgToplevelClient::sendPing(PingReason reason)
 {
     XdgShellInterface *shell = m_shellSurface->shell();
diff --git a/src/xdgshellclient.h b/src/xdgshellclient.h
index 7e02b6ad01..c619506df7 100644
--- a/src/xdgshellclient.h
+++ b/src/xdgshellclient.h
@@ -185,6 +185,8 @@ private:
     void handlePingTimeout(quint32 serial);
     void handlePingDelayed(quint32 serial);
     void handlePongReceived(quint32 serial);
+    void handleMaximumSizeChanged();
+    void handleMinimumSizeChanged();
     void initialize();
     void updateMaximizeMode(MaximizeMode maximizeMode);
     void updateFullScreenMode(bool set);