Expanded mail has fixed height regardless of its content

[l1gi]

Hi,

since some Ubuntu apt upgrade all expanded boxes in thread-view has fixed height approx 350px:

The only way how to see the rest of the content is to drag and move the mouse.

I removed ~/.config/astroid directory, no change.

Collapsed view looks same:

Could anyone tell me what could be wrong, please?

Thank you, m.