Add predefined size dropdown

[LarsJK]

We should consider changing the slider scale to a dropdown of predefined sizes and textfields for precise control.

Something like what preview.app has:

The predefined sizes should be a union of (ref comment):

• 1/nth of the input size: 1/2, 1/3, 1/4, 1/5, …, etc.
• a predefined list of common sizes: 960, 800, 640, 500, 480, 320, 256, 200, 160, 128, 80, 64

As mentioned in the comment 1/n scaling gives the best quality so we should maybe mark those in the dropdown.

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Note: This issue requires you to have a good understanding of Swift and macOS/iOS development.

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Backers (Total: $200.00)

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Submitted pull Requests

• #83 Add size dropdown in the save panel

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[sindresorhus]

Here are sizing GUI from different apps.

Pixelmator Pro

Pixelmator

Photoshop CC 2019

Preview

[sindresorhus]

If anyone wants to work on this, see the initial PR #49, which was never finished. Especially the feedback given there.

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