FIX: allows forcing unsafe string in select-kit (#6386)

forceEscape will be defaulted to true before next release.

test/javascripts/components/single-select-test.js.es6

@@ -771,3 +771,67 @@ componentTest("with no content and allowAny", {
     assert.ok(!$filter.hasClass("is-hidden"));
   }
 });
+
+componentTest("with forceEscape", {
+  template: "{{single-select content=content forceEscape=true}}",
+
+  beforeEach() {
+    this.set("content", ["<div>sam</div>"]);
+  },
+
+  async test(assert) {
+    await this.get("subject").expand();
+
+    const row = this.get("subject").rowByIndex(0);
+    assert.equal(
+      row
+        .el()
+        .find(".name")
+        .html()
+        .trim(),
+      "&lt;div&gt;sam&lt;/div&gt;"
+    );
+
+    assert.equal(
+      this.get("subject")
+        .header()
+        .el()
+        .find(".selected-name")
+        .html()
+        .trim(),
+      "&lt;div&gt;sam&lt;/div&gt;"
+    );
+  }
+});
+
+componentTest("without forceEscape", {
+  template: "{{single-select content=content forceEscape=false}}",
+
+  beforeEach() {
+    this.set("content", ["<div>sam</div>"]);
+  },
+
+  async test(assert) {
+    await this.get("subject").expand();
+
+    const row = this.get("subject").rowByIndex(0);
+    assert.equal(
+      row
+        .el()
+        .find(".name")
+        .html()
+        .trim(),
+      "<div>sam</div>"
+    );
+
+    assert.equal(
+      this.get("subject")
+        .header()
+        .el()
+        .find(".selected-name")
+        .html()
+        .trim(),
+      "<div>sam</div>"
+    );
+  }
+});