Remove isLarge attribute from buttons for WP 5.5

[nickcernis]

Prevents the “React does not recognize the isLarge prop on a DOM element” console warning in WP 5.5 caused by the isLarge attribute being removed in 5.5.

Testing instructions

Under WP 5.5:

1. Create a custom block containing an image field.
2. Add the custom block to a page.
3. Click the block to edit its fields. There should be no console warnings (used to be present due to the “Upload” and “Media Library” buttons).
4. Add an image and dismiss the image popover to return to the editor.
5. There should be no warning in the console (from the “Remove” button).

See

• Removal of isLarge: Button Component - remove isLarge prop WordPress/gutenberg#23239
• Note about isLarge having no effect in the first place due to missing styles: WP components audit: Button & IconButton WordPress/gutenberg#16541 (comment)

[mindctrl]

Good catch. We saw yesterday in GB and are removing it too.

[kienstra]

@nickcernis,
Thanks a lot for opening this! I'll probably merge it soon.

[kienstra]

Hi @nickcernis,
Thanks a lot for fixing this. The button still looks good, and there's no console warning: