Fix selectize clear logic and expand related tests

Updated the selector for removing selectize items to target only direct children, ensuring correct clearing behavior. Enhanced the test app to display selected values and expanded the test cases to verify selection and clearing of multiple choices.

Author: karangattu

shiny/playwright/controller/_input_controls.py

@@ -1199,7 +1199,7 @@ def set(
         self._loc_events.click()
 
         while True:
-            remove_button = self._loc_events.locator(".item .remove").first
+            remove_button = self._loc_events.locator("> .item > .remove").first
             if remove_button.count() == 0:
                 break
             remove_button.click()

tests/playwright/shiny/bugs/2013-selectize-set-does-not-clear/app_selectize.py

@@ -1,14 +1,20 @@
-from shiny import App, ui
+from shiny import App, ui, render
 
 app_ui = ui.page_fluid(
     ui.input_selectize(
-        "test_selectize", "Select", ["Choice 1", "Choice 2"], multiple=True
-    )
+        "test_selectize",
+        "Select",
+        ["Choice 1", "Choice 2", "Choice 3", "Choice 4"],
+        multiple=True,
+    ),
+    ui.output_text("test_selectize_output"),
 )
 
 
 def server(input, output, session):
-    pass
+    @render.text
+    def test_selectize_output():
+        return f"Selected: {', '.join(input.test_selectize())}"
 
 
 app = App(app_ui, server)

tests/playwright/shiny/bugs/2013-selectize-set-does-not-clear/test_app_selectize.py

@@ -10,10 +10,14 @@
 def test_inputselectize(page: Page, app: ShinyAppProc):
     page.goto(app.url)
 
-    controller.InputSelectize(page, "test_selectize").set(
-        ["Choice 1"]
-    )  # Add Choice 1 to selections
-    controller.InputSelectize(page, "test_selectize").set(
-        ["Choice 1", "Choice 2"]
-    )  # Add Choice 2 to selections
-    controller.InputSelectize(page, "test_selectize").set([])  # Clear selections
+    input_selectize = controller.InputSelectize(page, "test_selectize")
+    output_text = controller.OutputText(page, "test_selectize_output")
+
+    input_selectize.set(["Choice 1", "Choice 2", "Choice 3"])
+    output_text.expect_value("Selected: Choice 1, Choice 2, Choice 3")
+    input_selectize.set(["Choice 2", "Choice 3"])
+    output_text.expect_value("Selected: Choice 2, Choice 3")
+    input_selectize.set(["Choice 3"])
+    output_text.expect_value("Selected: Choice 3")
+    input_selectize.set([])
+    output_text.expect_value("Selected: ")