fix(gui): ensure correct selection in AutoDevInputSection #51

The `AutoDevInputSection` now correctly handles the selection of items in the list, regardless of the number of items present. Previously, the selected index was not being updated correctly when reaching the last or first item in the list. This has been fixed by using the actual count of items in the list instead of a hardcoded value.

src/main/kotlin/cc/unitmesh/devti/gui/chat/AutoDevInputSection.kt

@@ -191,6 +191,8 @@ class AutoDevInputSection(private val project: Project, val disposable: Disposab
             override fun keyPressed(e: KeyEvent?) {
                 if (!hasPopup()) return
 
+                val itemsCount = list.getItemsCount()
+
                 when (e?.keyCode) {
                     KeyEvent.VK_ENTER -> {
                         e.consume()
@@ -205,7 +207,6 @@ class AutoDevInputSection(private val project: Project, val disposable: Disposab
 
                     KeyEvent.VK_DOWN -> {
                         val selectedIndex = list.selectedIndex
-                        val itemsCount = list.getItemsCount()
                         if (selectedIndex < itemsCount - 1) {
                             list.setSelectedIndex(selectedIndex + 1)
                         } else {
@@ -218,7 +219,7 @@ class AutoDevInputSection(private val project: Project, val disposable: Disposab
                         if (selectedIndex > 0) {
                             list.setSelectedIndex(selectedIndex - 1)
                         } else {
-                            list.setSelectedIndex(list.getItemsCount() - 1)
+                            list.setSelectedIndex(itemsCount - 1)
                         }
                     }
                 }