MDL-33303 sees the filemanager become resizeable. During peer-review Apu noted it would be nice if everything used the same image for the resize handle. I agree and so think that we should probably look to implement our own resize handle image and use it consistently (even if we copy the current YUI image).

As a head start tiny MCE resize handle is set by:

.o2k7Skin .mceStatusbar a.mceResize {}

YUI resize component is set in CSS by:

.yui3-resize-handle-inner-r,

.yui3-resize-handle-inner-l,

.yui3-resize-handle-inner-t,

.yui3-resize-handle-inner-b,

.yui3-resize-handle-inner-tr,

.yui3-resize-handle-inner-br,

.yui3-resize-handle-inner-tl,

.yui3-resize-handle-inner-bl {}