fix(amazonq): change to use withExtensionFilter to hide unallowed files

.changes/next-release/bugfix-7029c1d5-212c-48ac-9513-38f0beca8fa8.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Fix unsupported files being shown in file picker when selecting images for adding image context in Windows"
+}

plugins/amazonq/shared/jetbrains-community/src-242/software/aws/toolkits/jetbrains/services/amazonq/lsp/util/FileChooserCompatImpl.kt

@@ -0,0 +1,26 @@
+// Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package software.aws.toolkits.jetbrains.services.amazonq.lsp.util
+
+import com.intellij.openapi.fileChooser.FileChooserDescriptor
+
+/**
+ * FileChooserCompat implementation for IntelliJ Platform versions before 2024.3 (baseline < 243).
+ * Uses withFileFilter method which provides filtering functionality but doesn't visually filter
+ * files in the chooser dialog.
+ */
+internal class FileChooserCompatImpl : FileChooserCompat {
+    override fun applyExtensionFilter(
+        descriptor: FileChooserDescriptor,
+        filterName: String,
+        allowedExtensions: Set<String>,
+    ): FileChooserDescriptor = descriptor.withFileFilter { virtualFile ->
+        if (virtualFile.isDirectory) {
+            true // Always allow directories for navigation
+        } else {
+            val extension = virtualFile.extension?.lowercase()
+            extension != null && allowedExtensions.contains(extension)
+        }
+    }
+}

plugins/amazonq/shared/jetbrains-community/src-243+/software/aws/toolkits/jetbrains/services/amazonq/lsp/util/FileChooserCompatImpl.kt

@@ -0,0 +1,19 @@
+// Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package software.aws.toolkits.jetbrains.services.amazonq.lsp.util
+
+import com.intellij.openapi.fileChooser.FileChooserDescriptor
+
+/**
+ * FileChooserCompat implementation for IntelliJ Platform versions 2024.3+ (baseline >= 243).
+ * Uses withExtensionFilter method which provides both filtering functionality and visual
+ * filtering in the chooser dialog.
+ */
+internal class FileChooserCompatImpl : FileChooserCompat {
+    override fun applyExtensionFilter(
+        descriptor: FileChooserDescriptor,
+        filterName: String,
+        allowedExtensions: Set<String>,
+    ): FileChooserDescriptor = descriptor.withExtensionFilter(filterName, *allowedExtensions.toTypedArray())
+}

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/AmazonQLanguageClientImpl.kt

@@ -64,6 +64,7 @@ import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ShowO
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ShowSaveFileDialogParams
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.chat.ShowSaveFileDialogResult
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.model.aws.credentials.ConnectionMetadata
+import software.aws.toolkits.jetbrains.services.amazonq.lsp.util.FileChooserCompat
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.util.LspEditorUtil
 import software.aws.toolkits.jetbrains.services.amazonq.lsp.util.TelemetryParsingUtil
 import software.aws.toolkits.jetbrains.services.codewhisperer.customization.CodeWhispererModelConfigurator
@@ -311,15 +312,8 @@ class AmazonQLanguageClientImpl(private val project: Project) : AmazonQLanguageC
                     if (params.filters.isNotEmpty() && !params.canSelectFolders) {
                         // Create a combined list of all allowed extensions
                         val allowedExtensions = params.filters.values.flatten().toSet()
-
-                        withFileFilter { virtualFile ->
-                            if (virtualFile.isDirectory) {
-                                true // Always allow directories for navigation
-                            } else {
-                                val extension = virtualFile.extension?.lowercase()
-                                extension != null && allowedExtensions.contains(extension)
-                            }
-                        }
+                        val fileChooserCompat = FileChooserCompat.getInstance()
+                        fileChooserCompat.applyExtensionFilter(this, "Images", allowedExtensions)
                     }
                 }
 

plugins/amazonq/shared/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonq/lsp/util/FileChooserCompat.kt

@@ -0,0 +1,32 @@
+// Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package software.aws.toolkits.jetbrains.services.amazonq.lsp.util
+
+import com.intellij.openapi.fileChooser.FileChooserDescriptor
+
+/**
+ * Compatibility interface for handling file chooser extension filtering across different IntelliJ Platform versions.
+ *
+ * The withExtensionFilter method was introduced in IntelliJ Platform 2024.3 (baseline version 243).
+ * For older versions, fall back to withFileFilter which provides similar functionality
+ */
+interface FileChooserCompat {
+    /**
+     * Applies file extension filtering to the given FileChooserDescriptor.
+     *
+     * @param descriptor The FileChooserDescriptor to apply filtering to
+     * @param filterName The display name for the filter (e.g., "Images")
+     * @param allowedExtensions Set of allowed file extensions (e.g., "jpg", "png")
+     * @return The modified FileChooserDescriptor
+     */
+    fun applyExtensionFilter(
+        descriptor: FileChooserDescriptor,
+        filterName: String,
+        allowedExtensions: Set<String>,
+    ): FileChooserDescriptor
+
+    companion object {
+        fun getInstance(): FileChooserCompat = FileChooserCompatImpl()
+    }
+}