The issue:
* exists with the following themes - Ambiant-MATE, Ambiant-MATE-Dark, BlackMATE, GreenLaguna, Radiant-MATE, TraditionalGreen, TraditionalOk;
* does not exist with BlueMenta, Blue-Submarine, Green-Submarine, High Contrast, High Contrast Inverse, Menta.
So all default `mate-themes` themes should be changed to have normal font in aforementioned dropdown menus. See BlueMenta as good example in attachment.
The issue:
* exists with the following themes - Ambiant-MATE, Ambiant-MATE-Dark, BlackMATE, GreenLaguna, Radiant-MATE, TraditionalGreen, TraditionalOk;
* does not exist with BlueMenta, Blue-Submarine, Green-Submarine, High Contrast, High Contrast Inverse, Menta.
So all default `mate-themes` themes should be changed to have normal font in aforementioned dropdown menus. See BlueMenta as good example in attachment.