Tooltip needs some attention.

[Flodkvist]

Tooltips needs a little work, this issue is created as a result of discussions on PR #1984 I´m not sure this is a good way to go about it formulating this issue, let me know if we have other conventions in this type of situation.

Summary from previous discussion.

1. Tooltips can sometimes have issues with z-index and lag.
2. Tooltips should appear when hovering on a tool and disappear when mouse pointer leaves the specific tool/button. Currently the tooltip can get stuck if mouse pointer hovers on tooltip which can happen in certain scenarios (see mentioned PR)

Problems 1 and 2 can be fixed with @tonnyandersson ´s solution:

3. Tool tips have some kind of anchor point which seems to be highlighted in white when tooltip is active. This is visible when background have a contrasting color.

Problem 3 could possibly be fixed with this:

4. I dont know if we need tooltips on everything but I think the editor controls should have it.