1.93.6 XnShell: Custom thumbnail size not remembered

[helmut]

In the current XnView Shell extension (Version 2.30), when setting a custom size like 300x200 this custom size is not remembered.

To reproduce:
1.) Right click on an image file and select "Options..." of XnView Shell extension.
2.) In the options dialog set "Custom thumbnail size" to 300 x 200.
3.) Confirm your settings with "OK".
4.) Open the options again. Instead of 300x200 you will see 300x300