fix(InputSelectize): Fix InputSelectize set method to clear selections

Updated the InputSelectize.set method to remove all selected items before setting new selections. Added regression test and example app to verify that selections are properly cleared when setting an empty list.

fixes #2013

Author: karangattu

shiny/playwright/controller/_input_controls.py

@@ -1197,6 +1197,13 @@ def set(
         if isinstance(selected, str):
             selected = [selected]
         self._loc_events.click()
+
+        while True:
+            remove_button = self._loc_events.locator(".item .remove").first
+            if remove_button.count() == 0:
+                break
+            remove_button.click()
+
         for value in selected:
             self._loc_selectize.locator(f"[data-value='{value}']").click(
                 timeout=timeout

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

@@ -0,0 +1,10 @@
+from shiny import App, ui
+
+app_ui = ui.page_fluid(
+    ui.input_selectize("test_selectize", "Select", ["Choice 1", "Choice 2"], multiple=True)
+)
+
+def server(input, output, session):
+    pass
+
+app = App(app_ui, server)

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

@@ -0,0 +1,13 @@
+from playwright.sync_api import Page
+from shiny.playwright import controller
+from shiny.pytest import create_app_fixture
+from shiny.run import ShinyAppProc
+
+app = create_app_fixture("app_selectize.py")
+
+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