Dialog Box "Open/Save/Export" doesn't update automatically

[gwiden]

Severity: Minor

Environment: Windows 10 Build 19044.1348 Version 21H2, LazPaint 7.1.6 (64-bit)

Description: the list of dir and files in the dialog box is updated only upon some action in the box.

Steps to reproduce:

1. Open LazPaint
2. File -> Open
3. Open the desktop dir in the dialog box
4. On the desktop, rename some object (out of the dialog box)

Expected result The object's name changed (in the dialog box)

Actual result The object's name wasn't change (in the dialog box)

https://user-images.githubusercontent.com/49672520/146641492-73071d65-b606-4c19-976e-f55d575e67a4.mp4

[circular17]

this could be done with DirectoryWatcher: https://forum.lazarus.freepascal.org/index.php/topic,37415.0.html