Properly use X11 startup ids

When one instance of Dolphin activates another it passes a startupId (X11) / activation token (wayland) along.

On X11 this is passed using the DESKTOP_STARTUP_ID environment variable. The code tries to read that through KStartupInfo::startupId().

That doesn't work though, since Qt at startup reads the environment variable afterwards. However, it is nice enough to allow us to access
it through QX11Info::nextStartupId(). Use that to read the token in the first instance and pass it to the second instance like we do on Wayland

The user-facing impact of this is minimal since KStartupInfo::setNewStartupId internally falls back to KWindowSystem::forceActiveWindow when no
startupId is passed.

5 files changed, 30 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1df8c19a0..d5aa7b112 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,6 +50,14 @@ find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     DBus
 )
 
+if (UNIX AND NOT APPLE)
+    set(HAVE_X11 TRUE)
+
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        find_package(Qt5X11Extras REQUIRED)
+    endif()
+endif()
+
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
     KCMUtils
     NewStuff
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7642c5c67..2d7cba790 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -471,6 +471,14 @@ target_link_libraries(dolphin
     KF5::Crash
 )
 
+if (HAVE_X11)
+    if (QT_MAJOR_VERSION STREQUAL "5")
+        target_link_libraries(dolphin PRIVATE Qt5::X11Extras)
+    else()
+        target_link_libraries(dolphin PRIVATE Qt::GuiPrivate)
+    endif()
+endif()
+
 include(DbusInterfaceMacros)
 
 generate_and_install_dbus_interface(
diff --git a/src/config-dolphin.h.cmake b/src/config-dolphin.h.cmake
index 61440cf3c..af78c8622 100644
--- a/src/config-dolphin.h.cmake
+++ b/src/config-dolphin.h.cmake
@@ -3,3 +3,4 @@
 #cmakedefine01 HAVE_KUSERFEEDBACK
 #cmakedefine01 HAVE_PACKAGEKIT
 #cmakedefine01 HAVE_TERMINAL
+#cmakedefine01 HAVE_X11
diff --git a/src/dolphinmainwindow.cpp b/src/dolphinmainwindow.cpp
index e4aa16d5f..f3ec70753 100644
--- a/src/dolphinmainwindow.cpp
+++ b/src/dolphinmainwindow.cpp
@@ -289,7 +289,7 @@ void DolphinMainWindow::activateWindow(const QString &activationToken)
     if (KWindowSystem::isPlatformWayland()) {
         KWindowSystem::setCurrentXdgActivationToken(activationToken);
     } else {
-        KStartupInfo::setNewStartupId(window()->windowHandle(), KStartupInfo::startupId());
+        KStartupInfo::setNewStartupId(window()->windowHandle(), activationToken.toUtf8());
     }
 
     KWindowSystem::activateWindow(window()->windowHandle());
diff --git a/src/main.cpp b/src/main.cpp
index a45083e40..a9b85dbcc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -35,6 +35,14 @@
 #include <QDBusConnectionInterface>
 #include <QSessionManager>
 
+#if HAVE_X11
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <private/qtx11extras_p.h>
+#else
+#include <QX11Info>
+#endif
+#endif
+
 #ifndef Q_OS_WIN
 #include <unistd.h>
 #endif
@@ -181,6 +189,10 @@ int main(int argc, char **argv)
         if (KWindowSystem::isPlatformWayland()) {
             token = qEnvironmentVariable("XDG_ACTIVATION_TOKEN");
             qunsetenv("XDG_ACTIVATION_TOKEN");
+        } else if (KWindowSystem::isPlatformX11()) {
+#if HAVE_X11
+            token = QX11Info::nextStartupId();
+#endif
         }
 
         if (Dolphin::attachToExistingInstance(urls, openFiles, splitView, QString(), token)) {