Clicking on editable placeholder should hide text

[mtias]

When clicking on editable's placeholder we should probably remove the placeholder text:

[ellatrix]

At the moment it's the same behaviour as a normal input field, which also leaves the text there on focus: https://codepen.io/iseulde/pen/mmjRYV

[jasmussen]

I tend to agree with Ella on this one. It feels a little weird since the text is centered here, but it's actually sort of how it "should" work.

[mtias]

Maybe the cursor and text alignment given the centered position is throwing me off.