river-layout: update to v3

- Remove advertise_view and advertise_done events. Using the information
provided by these for any purpose would make the layout far less
predictable. Futhermore, in the months this has been available for use,
to my knowledge nobody has actually used it for anything useful.

- Replace the set/mod layout value events with a single user_command
event. This simplifies the protocol and is more flexible for clients.

- Add a layout_name argument to the commit request. This name is an
arbitrary, user-facing string that might, for example, be displayed by a
status bar. This was present in early drafts of the protocol, but was
removed in favor of river-options. Since river-options itself has since
been removed and this feature is nice to have, re-add it.

- Rename main factor to main ratio in rivertile. The "factor" name was
just legacy from dwm, "ratio" is much more accurate.

river/Layout.zig

@@ -36,12 +36,12 @@ const LayoutDemand = @import("LayoutDemand.zig");
 
 const log = std.log.scoped(.layout);
 
-layout: *river.LayoutV2,
+layout: *river.LayoutV3,
 namespace: []const u8,
 output: *Output,
 
 pub fn create(client: *wl.Client, version: u32, id: u32, output: *Output, namespace: []const u8) !void {
-    const layout = try river.LayoutV2.create(client, version, id);
+    const layout = try river.LayoutV3.create(client, version, id);
 
     if (namespaceInUse(namespace, output, client)) {
         layout.sendNamespaceInUse();
@@ -92,7 +92,7 @@ fn namespaceInUse(namespace: []const u8, output: *Output, client: *wl.Client) bo
 
 /// This exists to handle layouts that have been rendered inert (due to the
 /// namespace already being in use) until the client destroys them.
-fn handleRequestInert(layout: *river.LayoutV2, request: river.LayoutV2.Request, _: ?*c_void) void {
+fn handleRequestInert(layout: *river.LayoutV3, request: river.LayoutV3.Request, _: ?*c_void) void {
     if (request == .destroy) layout.destroy();
 }
 
@@ -108,28 +108,19 @@ pub fn startLayoutDemand(self: *Self, views: u32) void {
         log.err("failed starting layout demand", .{});
         return;
     };
-    const serial = self.output.layout_demand.?.serial;
 
-    // Then we let the client know that we require a layout
     self.layout.sendLayoutDemand(
         views,
         self.output.usable_box.width,
         self.output.usable_box.height,
         self.output.pending.tags,
-        serial,
+        self.output.layout_demand.?.serial,
     );
 
-    // And finally we advertise all visible views
-    var it = ViewStack(View).iter(self.output.views.first, .forward, self.output.pending.tags, Output.arrangeFilter);
-    while (it.next()) |view| {
-        self.layout.sendAdvertiseView(view.pending.tags, view.getAppId(), serial);
-    }
-    self.layout.sendAdvertiseDone(serial);
-
     server.root.trackLayoutDemands();
 }
 
-fn handleRequest(layout: *river.LayoutV2, request: river.LayoutV2.Request, self: *Self) void {
+fn handleRequest(layout: *river.LayoutV3, request: river.LayoutV3.Request, self: *Self) void {
     switch (request) {
         .destroy => layout.destroy(),
 
@@ -168,7 +159,7 @@ fn handleRequest(layout: *river.LayoutV2, request: river.LayoutV2.Request, self:
     }
 }
 
-fn handleDestroy(layout: *river.LayoutV2, self: *Self) void {
+fn handleDestroy(layout: *river.LayoutV3, self: *Self) void {
     self.destroy();
 }