fix(TooltipContext): correct hit detection by accounting for chart padding (#806)

Author: blowindblo

.changeset/metal-flowers-sneeze.md

@@ -0,0 +1,5 @@
+---
+'layerchart': patch
+---
+
+fix(TooltipContext): correct `bisect-band` hit detection by accounting for chart padding

packages/layerchart/src/lib/components/tooltip/TooltipContext.svelte

@@ -310,8 +310,8 @@
 
         case 'bisect-band': {
           // `x` and `y` values at pointer coordinate
-          const xValueAtPoint = scaleInvert(ctx.xScale, point.x);
-          const yValueAtPoint = scaleInvert(ctx.yScale, point.y);
+          const xValueAtPoint = scaleInvert(ctx.xScale, point.x - ctx.padding.left);
+          const yValueAtPoint = scaleInvert(ctx.yScale, point.y - ctx.padding.top);
 
           if (isScaleBand(ctx.xScale)) {
             // Find point closest to pointer within the x band