Shortcuts to control font size as opposed to zoom level

[eramdam]

Is your feature request related to a problem? Please describe.
The current shortcuts to zoom in are convenient in a pinch, but I noticed they produce inconsistent results compared to iTerm/Apple Terminal.

Describe the solution you'd like
As far as I can tell, it's because Tabby's shortcuts zoom the content, whereas every other terminal "zoom" controls increase/decrease the font size. Would it be possible to either:

• Get specific shortcuts to increase the font size independently of the rest?
• Make it so the line height is consistent when zooming in/out?

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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