chore: changeset combobox: demos, Subclasser features and fixes

.changeset/metal-apes-bathe.md

@@ -0,0 +1,29 @@
+---
+"@lion/combobox": patch
+"@lion/listbox": patch
+---
+
+Combobox: demos, Subclasser features and fixes
+
+
+### Features
+- Subclassers can configure `_syncToTextboxCondition()`. By default only for `autocomplete="inline|both"`
+- Subclassers can configure `_showOverlayCondition(options)`.  For instance, already show once textbox gets focus or add your own custom
+- Subclassers can configure `_syncToTextboxMultiple(modelValue, oldModelValue)`.  See https://github.com/ing-bank/lion/issues/1038
+- Subclassers can configure `_autoSelectCondition`, for instance to have autcomplete="list" with auto select instead of manual selection. Both are possible according to w3c specs
+
+### Fixes
+- listbox multiselect can deselect again on 'Enter' and 'Space'. Closes https://github.com/ing-bank/lion/issues/1059
+- combobox multiselect display only shows last selected option in textbox (instead of all). See https://github.com/ing-bank/lion/issues/1038
+- default sync to textbox behavior for `autocomplete="none|list"` is no sync with textbox
+
+### Demos
+- created a google combobox demo (with anchors as options)
+  - advanced styling example
+  - uses autocomplete 'list' as a fundament and enhances `_showOverlayCondition` and `_syncToTextboxCondition`
+- enhanced whatsapp combobox demo
+  - how to match/highlight text on multiple rows of the option (not just choiceValue)
+
+### Potentially breaking for subclassers:
+- `_computeUserIntendsAutoFill` -> `__computeUserIntendsAutoFill` (not overridable)
+- `_syncCheckedWithTextboxOnInteraction ` is removed. Use `_syncToTextboxCondition` and/or `_syncToTextboxMultiple`