Eyedropper shortcut (middle mouse btn) should give visual feedback

[voithos]

Right now, using the middle mouse button to quickly select a color doesn't offer any visual feedback besides the color changing:

One approach might be to quickly change the cursor icon to the eyedropper upon mouse-down, and change it back to the active tool upon mouse-up.

[PrashBricks]

Good idea!

[juliandescottes]

Sounds like a good idea, thanks! With the current implementation, the easiest is to "flash" the cursor right after picking the color. The reason behind this is that if you hold middle click, you can also drag the viewport (which doesn't result in picking a color). So I can't accurately show the color picker icon on mousedown.

But the effect is similar and should convey the same meaning to the user.