Safari (WebKit layout engine) pseudo random issue breaking the layout

[bago]

We are aware of issues with the webkit engine used by Safari (not Chrome that uses Blink).

Most issues have been workarounded but there are a few less important issues we want to document.

1. Place a 3 articles block
2. Click to select an image placeholder
3. Open the gallery and click on an image from the gallery
4. Mosaico puts the image in the selected placeholder but Safari break the layout
5. Move the mouse to the block and Safari fix the layout

This doesn't happen if there is already an image instead of the placeholder and doesn't happen if you upload the image or drop an image from a dragging operation.