Make it possible to change the font size of just one selected editor window

In a multimonitor setup, when a editor is opened in a new window which is moved onto a side monitor,  it can be useful to enlarge the font of just that window to account for monitor sizes differencies, alas using CTRL+mouse wheel changes the font size in all editor windows.

One possible implementation could be to let the user press another modifier together with CTRL in order to only change that specific window's font size, like the SHIFT modifier. So SHIFT+CTRL+(mouse wheel/+/-) could modify the font size of just the focused window.