Editing Shopify emails in browser

Shopify Partner
36 0 3

When I am working on a Shopify email, every time I make a change, the current line being edited moves to the bottom of the screen, which is very disorienting.  Is there a way to make the browser behave more like a regular code editor and not move around?  Or is this specific to Chrome?   Any advice appreciated. 

Long time Zen Cart modder, getting started with Shopify.