Draw the whole 3D view in place of the client's renderer

The full view is now the default. While the renderer process covers the whole
view (Channel::covering, set after each frame it presents), the adapter skips
the client's renderer's clears and draws, decided per frame; the client's
renderer still gets state and resources, and draws again as soon as the
renderer process stops covering the view.

The client's window no longer gets WS_CLIPCHILDREN: the client draws when its
window gets WM_PAINT, which a window entirely covered by clipped children never
gets (it fell to about one frame a second). The flip model swap chain shows
above the client's drawing anyway.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

adapter/plugin.cpp

@@ -33,7 +33,7 @@ imvu::SharedPtr<imvu::PiRenderEngine> create_imvu_engine(imvu::SharedPtr<imvu::I
     return create(std::move(window), imvu::RendererType::Direct3D);
 }
 
-// What the renderer process draws: T5DE_RENDERER_VIEW=off, split (the default: the right half), full or compare.
+// What the renderer process draws: T5DE_RENDERER_VIEW=off, split (the right half), full (the default) or compare.
 // (The renderer process can also be switched while it runs: renderer/main.cpp.)
 protocol::View view()
 {
@@ -41,9 +41,9 @@ protocol::View view()
     GetEnvironmentVariableW(L"T5DE_RENDERER_VIEW", value, 16);
     const std::wstring_view setting = value;
     return setting == L"off"       ? protocol::View::Off
-           : setting == L"full"    ? protocol::View::Full
+           : setting == L"split"   ? protocol::View::Split
            : setting == L"compare" ? protocol::View::Compare
-                                   : protocol::View::Split;
+                                   : protocol::View::Full;
 }
 
 } // namespace