[plasma/union] src: Drop defaultInputPlugin() from PlatformPlugin

Git commit def72cc1c33cc919eaa44de6c37a9da3fe9a2319 by Arjen Hiemstra.
Committed on 05/08/2026 at 10:24.
Pushed by ahiemstra into branch 'master'.

Drop defaultInputPlugin() from PlatformPlugin

It is no longer necessary now that input plugin information comes from
the package.

M  +0    -5    src/PlatformPlugin.cpp
M  +0    -7    src/PlatformPlugin.h
M  +0    -5    src/platform/plasma/PlasmaPlatformPlugin.cpp
M  +0    -1    src/platform/plasma/PlasmaPlatformPlugin.h

https://invent.kde.org/plasma/union/-/commit/def72cc1c33cc919eaa44de6c37a9da3fe9a2319

diff --git a/src/PlatformPlugin.cpp b/src/PlatformPlugin.cpp
index 2e3bf882..4da806f6 100644
--- a/src/PlatformPlugin.cpp
+++ b/src/PlatformPlugin.cpp
@@ -14,11 +14,6 @@ PlatformPlugin::PlatformPlugin(QObject *parent)
 {
 }
 
-QString PlatformPlugin::defaultInputPlugin()
-{
-    return QString{};
-}
-
 QList<std::filesystem::path> Union::PlatformPlugin::stylePackagePaths()
 {
     const auto paths = QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, u"union/styles"_s, QStandardPaths::LocateDirectory);
diff --git a/src/PlatformPlugin.h b/src/PlatformPlugin.h
index 6429c72a..3ec6cf15 100644
--- a/src/PlatformPlugin.h
+++ b/src/PlatformPlugin.h
@@ -26,13 +26,6 @@ class UNION_EXPORT PlatformPlugin : public Plugin
 public:
     PlatformPlugin(QObject *parent = nullptr);
 
-    /*!
-     * Returns the platform's default input plugin.
-     *
-     * By default, this will return an empty string, which indicates all plugins
-     * should be searched for the default style name.
-     */
-    virtual QString defaultInputPlugin();
     /*!
      * Returns the platform's default style name.
      */
diff --git a/src/platform/plasma/PlasmaPlatformPlugin.cpp b/src/platform/plasma/PlasmaPlatformPlugin.cpp
index 2de1dbdd..ed364430 100644
--- a/src/platform/plasma/PlasmaPlatformPlugin.cpp
+++ b/src/platform/plasma/PlasmaPlatformPlugin.cpp
@@ -36,11 +36,6 @@ PlasmaPlatformPlugin::PlasmaPlatformPlugin(QObject *parent)
     });
 }
 
-QString PlasmaPlatformPlugin::defaultInputPlugin()
-{
-    return u"css"_s;
-}
-
 QString PlasmaPlatformPlugin::defaultStyleName()
 {
     // These values should really be queries by the CSS using media queries,
diff --git a/src/platform/plasma/PlasmaPlatformPlugin.h b/src/platform/plasma/PlasmaPlatformPlugin.h
index 7d04cfce..817e5c9e 100644
--- a/src/platform/plasma/PlasmaPlatformPlugin.h
+++ b/src/platform/plasma/PlasmaPlatformPlugin.h
@@ -15,7 +15,6 @@ class PlasmaPlatformPlugin : public Union::PlatformPlugin
 public:
     PlasmaPlatformPlugin(QObject *parent = nullptr);
 
-    QString defaultInputPlugin() override;
     QString defaultStyleName() override;
 
     QIcon platformIcon(const QString &name, const QColor &color) override;