backend: reset EGL surface after buffer swap

This prevents GL commands to affect a previously current EGL surface
after a buffer swap.

backend/drm/drm.c

@@ -569,6 +569,8 @@ static bool drm_connector_commit(struct wlr_output *output) {
 		}
 	}
 
+	wlr_egl_make_current(&drm->renderer.egl, EGL_NO_SURFACE, NULL);
+
 	return true;
 }
 

backend/headless/output.c

@@ -71,6 +71,9 @@ static bool output_test(struct wlr_output *wlr_output) {
 }
 
 static bool output_commit(struct wlr_output *wlr_output) {
+	struct wlr_headless_output *output =
+		headless_output_from_output(wlr_output);
+
 	if (!output_test(wlr_output)) {
 		return false;
 	}
@@ -89,6 +92,8 @@ static bool output_commit(struct wlr_output *wlr_output) {
 		wlr_output_send_present(wlr_output, NULL);
 	}
 
+	wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
+
 	return true;
 }
 

backend/wayland/output.c

@@ -297,6 +297,8 @@ static bool output_commit(struct wlr_output *wlr_output) {
 		}
 	}
 
+	wlr_egl_make_current(&output->backend->egl, EGL_NO_SURFACE, NULL);
+
 	return true;
 }
 

backend/x11/output.c

@@ -157,6 +157,8 @@ static bool output_commit(struct wlr_output *wlr_output) {
 		wlr_output_send_present(wlr_output, NULL);
 	}
 
+	wlr_egl_make_current(&x11->egl, EGL_NO_SURFACE, NULL);
+
 	return true;
 }