Scale by quantity

[ekcom]

First Check

• I used the GitHub search to find a similar requests and didn't find it.
• Checked the tasks tagged issues and verified my feature is not covered

Please provide a concise description of the problem that would be addressed by this feature.

Currently, there is no scale option to "one-and-a-half" a recipe.
Doing so requires me to do math on a calculator, which is not ideal.

Another example is if a recipe makes twelve (12) servings and I want sixteen (16) servings.
Mealie has no support for this, and back to the calculator I go.

Please provide a concise description of the feature that would resolve your issue.

Scale by quantity: Changing the scale no longer doubles the portions but instead bumps it by one.
E.g., if a recipe makes twelve (12) servings, pressing the + to increase the services changes it to thirteen (13), scaling the ingredients accordingly.

Potentially include options to change by one portion at a time and a button to double the portions (so that it is easy to make large-scale and fine-tuned adjustments).

Other cooking apps/websites have this feature.

Please consider and list out some caveats or tradeoffs made in your design decision

Costs:

• Dev time
  • Not very much though
• Potentially more cluttered UI if including both single serving adjustments and double serving adjustment buttons
• Scaling recipes up by, e.g., 1.2x will lead to some weird scaling for the ingredients (like 5/12 tbsp)

Additional Information

• If this is accepted I'm willing to submit a PR to provide this feature
• If this is accepted I'm willing to help maintain this feature
• I'm willing to sponsor/pay a developer to do this work

[ekcom]

I see that this was already requested in #1161 now, but the currently implemented solution does not suite my needs.

[michael-genson]

Also related to #1390

[Kuchenpirat]

This has been implemented by the scaling refactor in #4298