bug: Garmin 9k font size wrong in 1/2 and 1/4 layout

[mman]

Garmin 9k is 4k screen with physical resolution of 3840 × 2160 with 1px/pt mapping.

However when the app runs in 1/2 and 1/4 size of the screen, the Garmin browser incorrectly reports back screen dimensions as seen in the following screenshots:

1918 * 2 = 3 836
989 * 2 = 1 978

These are the complete measurements:

• 1/4: 1918 x 989 1px/pt
• 1/2h: 1918 x 1982 1px/pt
• 1/2v: 3840 x 989 1px/pt

~ 178px (10%) consumed vertically always.
~ 4px consumed horizontally in split modes.

It is therefore impossible (so far it seems) to determine proper font size for 1/4 layout...

For 1/2 layout we should use an or media query rule checking both horizontal and vertical screen resolution.