Fix clippy warnings surfaced by the merge

Pre-existing issues in the uncommitted rust-rewrite work (unused
imports, over-arity glyph-drawing functions, a couple of complex inline
types, or_insert_with(T::default) instead of or_default(), and one
unsimplified test-only arithmetic expression), plus two imports left
unused by switching to or_default(). None of these are behavior
changes. Full workspace build + clippy -D warnings + test suite (378
tests) all green after this.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/wayland/src/winit/render.rs b/crates/wayland/src/winit/render.rs
index 5784520..c245aa2 100644
--- a/crates/wayland/src/winit/render.rs
+++ b/crates/wayland/src/winit/render.rs
@@ -105,7 +105,7 @@ impl WaylandPlatform {
         {
             let color_filter = self.wm.borrow().color_filter;
             let output_name = self.output.name();
-            let buf = self.state.color_filter_buffers.entry(output_name).or_insert_with(SolidColorBuffer::default);
+            let buf = self.state.color_filter_buffers.entry(output_name).or_default();
             if let Some(elem) = crate::color_filter::render_element(buf, color_filter, (size.w, size.h)) {
                 custom_elements.push(crate::rounded_corners::WinitElement::Base(crate::elements::OverlayElement::Solid(elem)));
             }