fix(amazonq): add range field to indicate partial doc change

For the LSP's TextDocumentContentChangeEvent, if range is not specified, LSP would assume the contentChange is for the whole file and replace the file content with it, so if user is just making edits we need to specify range other wise file content will be replaced by this diff.

Author: andrewyuq

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

@@ -22,6 +22,8 @@ import org.eclipse.lsp4j.DidChangeTextDocumentParams
 import org.eclipse.lsp4j.DidCloseTextDocumentParams
 import org.eclipse.lsp4j.DidOpenTextDocumentParams
 import org.eclipse.lsp4j.DidSaveTextDocumentParams
+import org.eclipse.lsp4j.Position
+import org.eclipse.lsp4j.Range
 import org.eclipse.lsp4j.TextDocumentContentChangeEvent
 import org.eclipse.lsp4j.TextDocumentIdentifier
 import org.eclipse.lsp4j.TextDocumentItem
@@ -164,6 +166,9 @@ class TextDocumentServiceHandler(
             pluginAwareExecuteOnPooledThread {
                 val vFile = FileDocumentManager.getInstance().getFile(event.document) ?: return@pluginAwareExecuteOnPooledThread
                 toUriString(vFile)?.let { uri ->
+                    val editor = FileEditorManager.getInstance(project).selectedTextEditor ?: return@pluginAwareExecuteOnPooledThread
+                    val logicalPosition = editor.offsetToLogicalPosition(event.offset)
+                    val newLogicalPosition = editor.offsetToLogicalPosition(event.offset + event.newLength)
                     languageServer.textDocumentService.didChange(
                         DidChangeTextDocumentParams().apply {
                             textDocument = VersionedTextDocumentIdentifier().apply {
@@ -173,6 +178,7 @@ class TextDocumentServiceHandler(
                             contentChanges = listOf(
                                 TextDocumentContentChangeEvent().apply {
                                     text = event.newFragment.toString()
+                                    range = Range(Position(logicalPosition.line, logicalPosition.column), Position(newLogicalPosition.line, newLogicalPosition.column))
                                 }
                             )
                         }