fix: Secondary click event hit area (f7e12a6) (#688)

Author: xuelongqy

lib/src/indicator/footer/footer_locator.dart

@@ -210,7 +210,7 @@ class _FooterLocatorRenderSliver extends RenderSliverSingleBoxAdapter {
       // No cache extent.
       cacheExtent: math.min(childExtent, paintExtent),
       maxPaintExtent: math.max(childExtent, paintExtent),
-      hitTestExtent: paintedChildSize,
+      hitTestExtent: math.max(childExtent, paintedChildSize),
       hasVisualOverflow: childExtent > constraints.remainingPaintExtent ||
           constraints.scrollOffset > 0,
       visible: true,

lib/src/indicator/header/header_locator.dart

@@ -211,7 +211,6 @@ class _HeaderLocatorRenderSliver extends RenderSliverSingleBoxAdapter {
       // No cache extent.
       cacheExtent: math.min(childExtent, paintExtent),
       maxPaintExtent: math.max(childExtent, paintExtent),
-      // fix: second Event failure
       hitTestExtent: math.max(childExtent, paintedChildSize),
       hasVisualOverflow: childExtent > constraints.remainingPaintExtent ||
           constraints.scrollOffset > 0,