placeholderinputeventfilter: don't block media keys

While blindly typing with no outputs connected is unlikely to be intentional,
using the media keys likely is.

BUG: 491531

src/dpmsinputeventfilter.cpp

@@ -12,6 +12,7 @@
 #include "core/session.h"
 #include "input_event.h"
 #include "main.h"
+#include "utils/keys.h"
 #include "wayland/seat.h"
 #include "wayland_server.h"
 #include "workspace.h"
@@ -54,23 +55,7 @@ bool DpmsInputEventFilter::wheelEvent(WheelEvent *event)
 
 bool DpmsInputEventFilter::keyEvent(KeyEvent *event)
 {
-    static constexpr std::array s_mediaKeys = {
+    if (isMediaKey(event->key())) {
-        Qt::Key::Key_MediaLast,
-        Qt::Key::Key_MediaNext,
-        Qt::Key::Key_MediaPause,
-        Qt::Key::Key_MediaPlay,
-        Qt::Key::Key_MediaPrevious,
-        Qt::Key::Key_MediaRecord,
-        Qt::Key::Key_MediaStop,
-        Qt::Key::Key_MediaTogglePlayPause,
-        Qt::Key::Key_VolumeUp,
-        Qt::Key::Key_VolumeDown,
-        Qt::Key::Key_VolumeMute,
-        Qt::Key::Key_MicVolumeUp,
-        Qt::Key::Key_MicVolumeDown,
-        Qt::Key::Key_MicMute,
-    };
-    if (std::ranges::find(s_mediaKeys, event->key()) != s_mediaKeys.end()) {
         // don't wake up the screens for media or volume keys
         return false;
     }

src/placeholderinputeventfilter.cpp

@@ -8,6 +8,8 @@
 */
 
 #include "placeholderinputeventfilter.h"
+#include "input_event.h"
+#include "utils/keys.h"
 
 namespace KWin
 {
@@ -29,7 +31,7 @@ bool PlaceholderInputEventFilter::wheelEvent(WheelEvent *event)
 
 bool PlaceholderInputEventFilter::keyEvent(KeyEvent *event)
 {
-    return true;
+    return !isMediaKey(event->key());
 }
 
 bool PlaceholderInputEventFilter::touchDown(qint32 id, const QPointF &pos, std::chrono::microseconds time)

src/utils/keys.h

@@ -0,0 +1,38 @@
+/*
+    KWin - the KDE window manager
+    This file is part of the KDE project.
+
+    SPDX-FileCopyrightText: 2024 Xaver Hugl <xaver.hugl@gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+#pragma once
+
+#include <QInputEvent>
+#include <array>
+
+namespace KWin
+{
+
+static constexpr std::array s_mediaKeys = {
+    Qt::Key::Key_MediaLast,
+    Qt::Key::Key_MediaNext,
+    Qt::Key::Key_MediaPause,
+    Qt::Key::Key_MediaPlay,
+    Qt::Key::Key_MediaPrevious,
+    Qt::Key::Key_MediaRecord,
+    Qt::Key::Key_MediaStop,
+    Qt::Key::Key_MediaTogglePlayPause,
+    Qt::Key::Key_VolumeUp,
+    Qt::Key::Key_VolumeDown,
+    Qt::Key::Key_VolumeMute,
+    Qt::Key::Key_MicVolumeUp,
+    Qt::Key::Key_MicVolumeDown,
+    Qt::Key::Key_MicMute,
+};
+static inline bool isMediaKey(int key)
+{
+    return std::ranges::find(s_mediaKeys, key) != s_mediaKeys.end();
+}
+
+}