fix(amazonq): show diff.patch first, then parse it

Author: David Hasani

packages/core/src/codewhisperer/service/transformByQ/transformApiHandler.ts

@@ -827,11 +827,11 @@ async function processClientInstructions(jobId: string, clientInstructionsPath:
     getLogger().info(`CodeTransformation: copied project to ${destinationPath}`)
     const diffContents = await fs.readFileText(clientInstructionsPath)
     if (diffContents.trim()) {
-        const diffModel = new DiffModel()
-        diffModel.parseDiff(clientInstructionsPath, path.join(destinationPath, 'sources'), true)
         // show user the diff.patch
         const doc = await vscode.workspace.openTextDocument(clientInstructionsPath)
         await vscode.window.showTextDocument(doc, { viewColumn: vscode.ViewColumn.One })
+        const diffModel = new DiffModel()
+        diffModel.parseDiff(clientInstructionsPath, path.join(destinationPath, 'sources'), true)
     } else {
         // still need to set the project copy so that we can use it below
         transformByQState.setProjectCopyFilePath(path.join(destinationPath, 'sources'))

packages/core/src/codewhisperer/service/transformByQ/transformationResultsViewProvider.ts

@@ -166,6 +166,8 @@ export class DiffModel {
             throw new Error(CodeWhispererConstants.noChangesMadeMessage)
         }
 
+        getLogger().info(`CodeTransformation: parsing patch file at ${pathToDiff}`)
+
         let changedFiles = parsePatch(diffContents)
         // exclude dependency_upgrade.yml from patch application
         changedFiles = changedFiles.filter((file) => !file.oldFileName?.includes('dependency_upgrade'))