Image block: width and height input fields in inspector do not start at current values

[ZebulanStanphill]

The issue

The Width and Height input fields in the block inspector settings for the Image block have placeholder text displaying the current height and width. However, I think this is a bit misleading as when you try to change the input values by pressing the up/down arrows added by browsers, the inputs start at 0. The inputs should start at the current width/height values.

Related issues and PRs

• Image resizing should be operable with a keyboard #3977
• No way to lock aspect ratio in Image block when using height/width inputs in inspector #7636
• Image block width and height input fields in inspector allow negative values #7637
• Image block: consolidate + simplify size controls #8397

[designsimply]

Tested and confirmed with the following steps:

1. Click the 'Add Block' button and select 'Image'.
2. Select an image from the media library or upload one.
3. Go to Settings > Block.
4. Place cursor in the Width field and press the up arrow.

Result: my original image width was 3868 and I expected that pressing the up arrow would change the number to 3869 but it changed to 1 instead.

^{Seen at http://alittletestblog.com/wp-admin/post.php?post=13859&action=edit running WordPress 4.9.6 and Gutenberg 3.1.1 using Firefox 61.0 on macOS 10.13.5.}