add support for the data control protocol

Enables the protocol documented at
https://wayland.app/protocols/ext-data-control-v1

It is the upstreamed version of the old wlr_data_control.

It is used e.g. by mpv to read and write the clipboard.

README.md

@@ -1,13 +1,5 @@
 # dwl - dwm for Wayland
 
-2025-08-16:  
-dwl IS CURRENTLY UN-MAINTAINED.  
-AT THE PRESENT TIME, I (@fauxmight) DO NOT HAVE  
-THE TIME OR CAPACITY TO KEEP UP WITH [wlroots] CHANGES.  
-IF YOU ARE INTERESTED IN TAKING ON LEAD DEVELOPER RESPONSIBILITIES,  
-SEE ISSUE [#1166](https://codeberg.org/dwl/dwl/issues/1166).
----
-
 Join us on our IRC channel: [#dwl on Libera Chat]  
 Or on the community-maintained [Discord server].
 

dwl.c

@@ -24,6 +24,7 @@
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_drm.h>
 #include <wlr/types/wlr_export_dmabuf_v1.h>
+#include <wlr/types/wlr_ext_data_control_v1.h>
 #include <wlr/types/wlr_fractional_scale_v1.h>
 #include <wlr/types/wlr_gamma_control_v1.h>
 #include <wlr/types/wlr_idle_inhibit_v1.h>
@@ -2518,6 +2519,7 @@ setup(void)
 	wlr_export_dmabuf_manager_v1_create(dpy);
 	wlr_screencopy_manager_v1_create(dpy);
 	wlr_data_control_manager_v1_create(dpy);
+	wlr_ext_data_control_manager_v1_create(dpy, 1);
 	wlr_primary_selection_v1_device_manager_create(dpy);
 	wlr_viewporter_create(dpy);
 	wlr_single_pixel_buffer_manager_v1_create(dpy);