implement PartialEq so we can compare tiles without comparing IDs

src/tile.rs

@@ -1,7 +1,7 @@
 use crate::{optional_data_line, AnimationFrames, Image};
 use crate::image::animation_frames_from_string;
 
-#[derive(Clone, Debug, Eq, PartialEq)]
+#[derive(Clone, Debug, Eq)]
 pub struct Tile {
     pub id: String,
     pub name: Option<String>,
@@ -10,6 +10,18 @@ pub struct Tile {
     pub colour_id: Option<u64>,
 }
 
+impl PartialEq for Tile {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+        &&
+        self.wall == other.wall
+        &&
+        self.animation_frames == other.animation_frames
+        &&
+        self.colour_id == other.colour_id
+    }
+}
+
 impl Tile {
     #[inline]
     fn name_line(&self) -> String {
@@ -130,4 +142,12 @@ mod test {
 
         assert_eq!(output, expected);
     }
+
+    #[test]
+    fn test_partial_eq() {
+        let     tile_a = crate::mock::tile_default();
+        let mut tile_b = crate::mock::tile_default();
+        tile_b.id = "0".to_string();
+        assert_eq!(tile_a, tile_b);
+    }
 }