added css variables for minimap mask, set default mask-stroke to 0

packages/svelte/src/lib/plugins/Minimap/Minimap.svelte

@@ -27,7 +27,7 @@
   export let bgColor: $$Props['bgColor'] = undefined;
   export let maskColor: $$Props['maskColor'] = undefined;
   export let maskStrokeColor: $$Props['maskStrokeColor'] = undefined;
-  export let maskStrokeWidth: $$Props['maskStrokeWidth'] = 1;
+  export let maskStrokeWidth: $$Props['maskStrokeWidth'] = undefined;
   export let width: $$Props['width'] = undefined;
   export let height: $$Props['height'] = undefined;
   export let pannable: $$Props['pannable'] = true;
@@ -83,7 +83,7 @@
 
 <Panel
   {position}
-  style={style + `;--xy-minimap-background-color-props:${bgColor}`}
+  style={style + (bgColor ? `;--xy-minimap-background-color-props:${bgColor}` : '')}
   class={cc(['svelte-flow__minimap', className])}
   data-testid="svelte-flow__minimap"
 >
@@ -96,6 +96,8 @@
       role="img"
       aria-labelledby={labelledBy}
       style:--xy-minimap-mask-background-color-props={maskColor}
+      style:--xy-minimap-mask-stroke-color-props={maskStrokeColor}
+      style:--xy-minimap-mask-stroke-width-props={(maskStrokeWidth ?? 0) * viewScale}
       use:interactive={{
         panZoom: $panZoom,
         viewport,
@@ -135,8 +137,6 @@
           offset * 2}h{-viewboxWidth - offset * 2}z
       M{viewBB.x},{viewBB.y}h{viewBB.width}v{viewBB.height}h{-viewBB.width}z"
         fill-rule="evenodd"
-        stroke={maskStrokeColor}
-        stroke-width={maskStrokeWidth ?? 1 * viewScale}
         pointer-events="none"
       />
     </svg>