Panel resize handles and cursor indicator handles are not visible in Linux

There aren't any resize handles in Windows or OSX either. When you mouse over the border you get the <-> cursor on Windows. If the cursor doesn't show up on Linux, I agree that needs to be fixed. However, I don't think I'd like dedicating extra width on the whole bar for a resize handle is necessary.

I completely agree that no extra screen real estate need be dedicated to just handles. Just an indication from cursor change on mouse over would be sufficient.