Fix clippy lints and add polygon tool button icon

1 files changed, 2 insertions, 3 deletions

diff --git a/src/tool/polygon_room_tool.rs b/src/tool/polygon_room_tool.rs
index 58f326f..42874e8 100644
--- a/src/tool/polygon_room_tool.rs
+++ b/src/tool/polygon_room_tool.rs
@@ -33,9 +33,8 @@ impl UnfinishedPolygon {
         // TODO: Is this possible without changing the mutability of self and without reallocation?
         let mut corners = self.corners.clone();
         corners.push(self.working_corner);
-        let res = Polygon::check_validity(&corners);
 
-        res
+        Polygon::check_validity(&corners)
     }
 
     pub fn try_into_completed(&mut self) -> Option<Polygon<f32>> {
@@ -65,7 +64,7 @@ impl UnfinishedPolygon {
     }
 
     pub fn try_push_working(&mut self) -> Result<(), PolygonError<f32>> {
-        assert!(self.corners.len() >= 1);
+        assert!(!self.corners.is_empty());
 
         if self.corners.len() == 1 {
             return if self.corners[0] != self.working_corner {