1.3.1 - histogram - context menu radio buttons

[user0]

XnView: MP 1.3.1 64bits
OS: Windows 64bit (22H2), display resolution 3840x2160, win scaling 150%

Image properties → Histogram tab

Context menu has few issues:
issue A - there shall be radio buttons, not checkboxes
issue B - radio button is missing for the background group

[xnview]

Thanks to your detailed description I can reproduce the problem.

[user0]

fixed in 1.4.0 beta 1