Pixelated taskbar icons

I’ve installed a Tumbleweed ISO that I downloaded 2015/06/22. I have some applications open, such as Konsole, Firefox, etc. and there are icons for them in the task bar (panel at the bottom). I increase the height of the taskbar. Now the icons in the taskbar do not scale well, and are ugly. So they are not SVG, but are being scaled up from a smaller image file. This was not a problem in KDE 4 or for that matter any windowing environment I’ve used in the past many years.

Not only that, but when I hide the bottom panel, and then hover close to the bottom of the screen, there is an ugly blue bar that pops up which is about 90% of the width of the screen.