Fix IDE compatibility

Author: pplam

src/main/kotlin/ai/devchat/plugin/completion/agent/ContextBuilder.kt

@@ -7,7 +7,6 @@ import ai.devchat.common.IDEUtils.foldTextOfLevel
 import ai.devchat.common.IDEUtils.runInEdtAndGet
 import ai.devchat.common.Log
 import ai.devchat.storage.RecentFilesTracker
-import com.intellij.openapi.vfs.isFile
 import com.intellij.psi.PsiFile
 import com.intellij.psi.util.PsiUtilCore.getPsiFile
 
@@ -157,7 +156,7 @@ class ContextBuilder(val file: PsiFile, val offset: Int) {
         val project = file.project
         return runInEdtAndGet {
             project.getService(RecentFilesTracker::class.java).getRecentFiles().asSequence()
-                .filter { it.isFile && it.path != filepath }
+                .filter { it.isValid && !it.isDirectory && it.path != filepath }
                 .map { CodeSnippet(it.path, getPsiFile(project, it).foldTextOfLevel(2)) }
                 .filter { it.content.lines().count(String::isBlank) <= 50 }
                 .takeWhile(::checkAndUpdateTokenCount)

src/main/kotlin/ai/devchat/storage/RecentFilesTracker.kt

@@ -10,7 +10,6 @@ import com.intellij.openapi.project.Project
 import com.intellij.openapi.roots.ProjectFileIndex
 import com.intellij.openapi.startup.ProjectActivity
 import com.intellij.openapi.vfs.VirtualFile
-import com.intellij.openapi.vfs.isFile
 import com.intellij.util.messages.MessageBusConnection
 
 
@@ -26,7 +25,7 @@ class RecentFilesTracker(private val project: Project) {
         val connection: MessageBusConnection = project.messageBus.connect()
         connection.subscribe(FileEditorManagerListener.FILE_EDITOR_MANAGER, object : FileEditorManagerListener {
             override fun fileOpened(source: FileEditorManager, file: VirtualFile) {
-                if (file.isFile) {
+                if (file.isValid && !file.isDirectory) {
                     addRecentFile(file)
                 }
             }
@@ -37,7 +36,7 @@ class RecentFilesTracker(private val project: Project) {
     }
 
     private fun addRecentFile(file: VirtualFile) = runInEdt {
-        if (file.isFile && projectFileIndex.isInContent(file)) {
+        if (file.isValid && !file.isDirectory && projectFileIndex.isInContent(file)) {
             recentFiles.remove(file)
             recentFiles.add(0, file)
             if (recentFiles.size > maxSize) {