Support wlr-screencopy

Closes https://github.com/ifreund/river/issues/7

 src/c.zig      | 1 +
 src/server.zig | 2 ++
 src/view.zig   | 2 +-
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/c.zig b/src/c.zig
index d2080d2..a551d8e 100644
--- a/src/c.zig
+++ b/src/c.zig
@@ -17,6 +17,7 @@ pub usingnamespace @cImport({
     @cInclude("wlr/types/wlr_output.h");
     @cInclude("wlr/types/wlr_output_layout.h");
     @cInclude("wlr/types/wlr_pointer.h");
+    @cInclude("wlr/types/wlr_screencopy_v1.h");
     @cInclude("wlr/types/wlr_seat.h");
     @cInclude("wlr/types/wlr_xcursor_manager.h");
     @cInclude("wlr/types/wlr_xdg_decoration_v1.h");
diff --git a/src/server.zig b/src/server.zig
index db00173..1c7fa66 100644
--- a/src/server.zig
+++ b/src/server.zig
@@ -84,6 +84,8 @@ pub const Server = struct {
             return error.CantCreateWlrCompositor;
         _ = c.wlr_data_device_manager_create(self.wl_display) orelse
             return error.CantCreateWlrDataDeviceManager;
+        _ = c.wlr_screencopy_manager_v1_create(self.wl_display) orelse
+            return error.CantCreateWlrScreencopyManager;
         _ = c.wlr_xdg_output_manager_v1_create(self.wl_display, self.root.wlr_output_layout) orelse
             return error.CantCreateWlrOutputManager;
 
diff --git a/src/view.zig b/src/view.zig
index 1c60080..7fab391 100644
--- a/src/view.zig
+++ b/src/view.zig
@@ -213,7 +213,7 @@ pub const View = struct {
             self.natural_height = @intCast(u32, self.wlr_xdg_surface.surface.*.current.height);
         }
 
-        const app_id: ?[*:0]const u8 = self.wlr_xdg_surface.unnamed_165.toplevel.*.app_id;
+        const app_id: ?[*:0]const u8 = self.wlr_xdg_surface.unnamed_166.toplevel.*.app_id;
         Log.Debug.log("View with app_id '{}' mapped", .{if (app_id) |id| id else "NULL"});
 
         // Make views with app_ids listed in the float filter float