Changed files not detected for file upload

### Apache NetBeans version

Apache NetBeans 25

### What happened

Upon editing and saving any file in a PHP project, the changed file is not detected when Source Files > Upload is selected. This used to work with NetBeans 8.1 which I keep just for detecting changed files and uploading. I use NetBeans 25 to edit files. When it is time to upload files, I use NetBeans 8.1 because it still detects the changed files.

### Language / Project Type / NetBeans Component

PHP project

### How to reproduce

1. Install a version of NetBeans newer than version 8.1.
2. Edit and save a file in an existing project.
3. Select Source Files > Upload.
4. See in the "File Upload" dialog at the bottom "0 files selected" because there were 0 files detected as having been changed.

### Did this work correctly in an earlier version?

Apache NetBeans 16 or earlier

### Operating System

Windows 10

### JDK

18

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

To my knowledge, this feature last worked with version 8.1. It has not worked with versions 12.4, 13, or 25. I wish I knew what mechanism NetBeans uses to detect changed files so that I could troubleshoot this problem and not have to use version 8.1 anymore.

### Are you willing to submit a pull request?

Yes

Start by tracing the Source Files > Upload flow and the File Upload dialog's changed-file detection for PHP projects. Compare behavior between NetBeans 8.1 and newer versions on Windows 10, then verify that editing and saving a project file causes it to be detected and selected for upload.

Written by the indexing model from the issue text.