Potential solution to supporting transparent 'show more' buttons

In this demonstration, we remove the cutting line (as it collides with the tile in a weird spot) and instead replace the tile with a placeholder when the text is about to collide with the avatar in the tile. We use a `round()` for this because through some amazing coincidence the collision happens at 0.47, which is close enough to 0.5 for people not to notice.

src/stores/room-list/ListLayout.ts

@@ -109,10 +109,6 @@ export class ListLayout {
         return this.tilesToPixels(Math.min(maxTiles, n)) + padding;
     }
 
-    public tilesWithResizerBoxFactor(n: number): number {
-        return n + RESIZER_BOX_FACTOR;
-    }
-
     public tilesWithPadding(n: number, paddingPx: number): number {
         return this.pixelsToTiles(this.tilesToPixelsWithPadding(n, paddingPx));
     }