Editor scrolls all the way up/down when pressing PgUp/PgDn

[Misterke]

Describe the bug:
When using the editor of Mainsail on a longer file (ex. a gcode file), pressing PgDn or PgUp (PageDown or PageUp) does not scroll down/up a single page, but jumps all the way to the end/beginning of the file.

Expected behavior:
Expectation is that both keys would only scroll the content a single page, i.e. roughly 90-100% of the number of lines actually visible on the screen.

I have tested this in both Chrome and Edge and as far as I can tell this problem is 100%. Trying to debug the Javascript, I get the impression the amount being scrolled is calculated from the height of some element which actually has its height determined by the complete content of the editor, not just the lines visible on the screen. As I'm not sufficiently versed in this type of code, I could not pinpoint the cause further, sorry ...