Alignment with Carbon version 10.27 (#495)

* chore(deps-dev): bump devDependencies

* docs: update number of available carbon icons

* feat(notification): distinguish dispatched close event between click/timeout

* fix(notification): prevent class from being overriden by $$restProps

* docs(notification): improve example body copy

* fix(notification): remove notificationType prop

* refactor(notification): resolve svelte file in imports

* fix(notification): prevent class from being overridden by $$restProps

* feat(notification): update TS signature for dispatched close event

* docs: update contributing

* fix(loading): adjust spinner styles

* feat(tag): support custom icon variant

* feat(tile): add optional expand/collapse icon labels to ExpandableTile

* feat(code-snippet): support disabled state for single and multi-line types

* fix(code-snippet): remove impossible class directive

* fix(code-snippet): showMoreLess button size should be "field", not "small"

* fix(password-input): disable visibility button

- set default values for tooltipAlignment, tooltipPosition

* fix(text-input): add missing warning field wrapper class

* feat(button): infer hasIconOnly using $$slots API

- requires Svelte version >=3.25

* docs(button): add danger tertiary, icon-only example

* feat(button): set default values for tooltip alignment, position

* docs: document dynamic theming

* fix(modal): correctly set class props #482

* fix(form): forward submit event in FluidForm #487

* feat(dropdown): support warning state

* feat(multi-select): support warning state

* fix(multi-select): prevent dropdown from opening if disabled

* feat(number-input): support warning state

* chore(deps-dev): upgrade devDependencies

* docs:  bump @carbon/themes, carbon-components

* refactor(data-table): co-locate DataTableSkeleton with DataTable

* docs: update number of pictograms

* fix(password-input): add missing "bx--btn" class to visibility toggle

* docs: increase z-index for component preview

src/Tile/ExpandableTile.svelte

@@ -17,6 +17,12 @@
   /** Specify the icon text of the expanded tile */
   export let tileExpandedIconText = "Interact to collapse Tile";
 
+  /** Specify the icon label of the expanded tile */
+  export let tileExpandedLabel = "";
+
+  /** Specify the icon label of the collapsed tile */
+  export let tileCollapsedLabel = "";
+
   /** Specify the tabindex */
   export let tabindex = "0";
 
@@ -27,7 +33,7 @@
   export let ref = null;
 
   import { afterUpdate } from "svelte";
-  import ChevronDown16 from "carbon-icons-svelte/lib/ChevronDown16";
+  import ChevronDown16 from "carbon-icons-svelte/lib/ChevronDown16/ChevronDown16.svelte";
 
   let refContent = null;
   let refAbove = null;
@@ -45,10 +51,13 @@
   });
 </script>
 
-<div
+<button
   bind:this="{ref}"
+  type="button"
   id="{id}"
+  aria-expanded="{expanded}"
   tabindex="{tabindex}"
+  title="{expanded ? tileExpandedIconText : tileCollapsedIconText}"
   class:bx--tile="{true}"
   class:bx--tile--expandable="{true}"
   class:bx--tile--is-expanded="{expanded}"
@@ -60,45 +69,24 @@
     expanded = !expanded;
   }}"
   on:keypress
-  on:keypress="{(e) => {
-    if (e.key === ' ' || e.key === 'Enter') {
-      e.preventDefault();
-      expanded = !expanded;
-    }
-  }}"
   on:mouseover
   on:mouseenter
   on:mouseleave
 >
   <div bind:this="{refContent}">
     <div bind:this="{refAbove}" class:bx--tile-content="{true}">
-      <span
-        class:bx--tile-content__above-the-fold="{true}"
-        on:click
-        on:mouseover
-        on:mouseenter
-        on:mouseleave
-      >
+      <span class:bx--tile-content__above-the-fold="{true}">
         <slot name="above" />
       </span>
     </div>
-    <button
-      aria-expanded="{expanded}"
-      aria-label="{expanded ? tileExpandedIconText : tileCollapsedIconText}"
-      class:bx--tile__chevron="{true}"
-    >
+    <div class:bx--tile__chevron="{true}">
+      <span>{expanded ? tileExpandedLabel : tileCollapsedLabel}</span>
       <ChevronDown16 />
-    </button>
+    </div>
     <div class:bx--tile-content="{true}">
-      <span
-        on:click
-        on:mouseover
-        on:mouseenter
-        on:mouseleave
-        class:bx--tile-content__below-the-fold="{true}"
-      >
+      <span class:bx--tile-content__below-the-fold="{true}">
         <slot name="below" />
       </span>
     </div>
   </div>
-</div>
+</button>