Pass in query params by default

Before, default `src` was set using `request.path` which returns virtual
path without query string.

This PR changes default implementation to use `request.fullpath` which
returns virtual path with query string.

Form example; In our app we have one controller endpoint where we filter
the results not just base on user entry `q` but also query strings.

lib/hotwire_combobox/helper.rb

@@ -41,7 +41,7 @@ def hw_combobox_options(
     def hw_paginated_combobox_options(
           options,
           for_id: params[:for_id],
-          src: request.path,
+          src: request.fullpath,
           next_page: nil,
           render_in: {},
           include_blank: {},
@@ -166,7 +166,7 @@ def hw_combobox_page_stream_action
 
       def hw_uri_with_params(url_or_path, **params)
         URI.parse(url_or_path).tap do |url_or_path|
-          query = URI.decode_www_form(url_or_path.query || "").to_h.merge(params)
+          query = URI.decode_www_form(url_or_path.query || "").to_h.merge(params.stringify_keys)
           url_or_path.query = URI.encode_www_form query
         end.to_s
       rescue URI::InvalidURIError

test/helpers/hotwire_combobox/helper_test.rb

@@ -120,4 +120,17 @@ class HotwireCombobox::HelperTest < ApplicationViewTestCase
       combobox_tag :foo, multiselect_chip_src: "some_path", name_when_new: :foo
     end
   end
+
+  test "hw_combobox_next_page_uri updates URI with pagination params while preserving other parameters" do
+    uri         = "/foo"
+    complex_uri = "#{uri}?exclude_id=5&page=1&q=&for_id=movie_id&format=turbo_stream"
+    next_page   = 2
+    for_id      = "movie_id"
+
+    expected_next_page_uri = "#{uri}?page=#{next_page}&q&for_id=#{for_id}&format=turbo_stream"
+    assert_equal expected_next_page_uri, hw_combobox_next_page_uri(uri, next_page, for_id)
+
+    expected_next_page_uri = "#{uri}?exclude_id=5&page=#{next_page}&q&for_id=#{for_id}&format=turbo_stream"
+    assert_equal expected_next_page_uri, hw_combobox_next_page_uri(complex_uri, next_page, for_id)
+  end
 end