[JetBrains] Fix an issue with exiting the multi-caret mode (#8179)

My [fix](https://github.com/sourcegraph/cody/pull/8071) broke exiting
from multiline caret mode 🥲

This PR fixes the issue by using the built-in chain of responsibility
responsibly 😅

## Test Plan

### Test Case 1: Multiline Mode + Auto-edit Dismissal
**Setup:**
- No Vim extension enabled
- Open any file in editor
- Add multiple cursors (Ctrl/Cmd + Alt + Click or similar)
- Enter multiline editing mode

**Steps:**
1. Trigger auto-edit suggestion (type code that generates autocomplete)
2. Verify popup/inlay appears
3. Press `Escape` key

**Expected Result:**
- Auto-edit popup/inlay is dismissed
- Multiline cursor mode is exited (returns to single cursor)
- Editor returns to normal single-cursor state

### Test Case 2: Vim Insert Mode + Auto-edit Dismissal  
**Setup:**
- Vim extension (IdeaVim) enabled
- Open any file in editor
- Enter Vim insert mode (`i`, `a`, `o`, etc.)

**Steps:**
1. While in insert mode, trigger auto-edit suggestion
2. Verify popup/inlay appears
3. Press `Escape` key

**Expected Result:**
- Auto-edit popup/inlay is dismissed
- Vim exits insert mode and returns to normal mode
- Cursor behavior follows Vim normal mode conventions

### Test Case 3: Baseline - No Special Mode
**Setup:**
- No Vim extension
- Single cursor, normal editing mode

**Steps:**
1. Trigger auto-edit suggestion
2. Verify popup/inlay appears  
3. Press `Escape` key

**Expected Result:**
- Auto-edit popup/inlay is dismissed
- Editor remains in normal editing state
- No unexpected mode changes

---

**Note:** These test cases verify that the handler properly participates
in IntelliJ's action chain, allowing both autocomplete dismissal AND the
underlying editor action (multiline exit, vim mode change) to execute
correctly.



<!-- Required. See
https://docs-legacy.sourcegraph.com/dev/background-information/testing_principles.
-->

Author: mkondratek

jetbrains/src/main/kotlin/com/sourcegraph/cody/autocomplete/action/DisposeAutocompleteSuggestionActionHandler.kt

@@ -3,13 +3,22 @@ package com.sourcegraph.cody.autocomplete.action
 import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.editor.Caret
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.actionSystem.EditorActionHandler
 import com.sourcegraph.cody.autocomplete.CodyAutocompleteManager
 import com.sourcegraph.cody.autoedit.AutoeditManager
 
-class DisposeAutocompleteSuggestionActionHandler : AutocompleteActionHandler() {
+class DisposeAutocompleteSuggestionActionHandler(private val originalHandler: EditorActionHandler) :
+    AutocompleteActionHandler() {
   override fun doExecute(editor: Editor, caret: Caret?, dataContext: DataContext?) {
-    val project = editor.project ?: return
-    CodyAutocompleteManager.getInstance(project).disposeInlays(editor)
-    AutoeditManager.getInstance(project).hide()
+    editor.project?.let {
+      CodyAutocompleteManager.getInstance(it).disposeInlays(editor)
+      AutoeditManager.getInstance(it).hide()
+    }
+
+    originalHandler.execute(editor, caret, dataContext)
   }
+
+  override fun isEnabledForCaret(editor: Editor, caret: Caret, dataContext: DataContext?) =
+      if (super.isEnabledForCaret(editor, caret, dataContext)) true
+      else originalHandler.isEnabled(editor, caret, dataContext)
 }

jetbrains/src/main/resources/META-INF/plugin.xml

@@ -53,7 +53,7 @@
         <editorActionHandler
             id="cody.disposeAutocompleteSuggestionHandler" action="EditorEscape"
             implementationClass="com.sourcegraph.cody.autocomplete.action.DisposeAutocompleteSuggestionActionHandler"
-            order="after ideavim-esc"/>
+        />
 
         <applicationService
                 serviceImplementation="com.sourcegraph.cody.auth.deprecated.DeprecatedCodyPersistentAccounts"/>