On OSX, undocked tilesets window prevents bringing editor window to the foreground.

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Currently, on OSX (10.9), Tiled (0.9.1) practically requires the use of very high resolution or multiple monitors due to the behavior of the undocked tilesets window. Single monitor users cannot switch between overlapping editor and tilesets windows since tilesets prevents the editor from being brought to the foreground. Similarly, the tilesets window cannot be dragged to a separate OSX space. While the behavior works ok on multiple displays, (editor and tilesets work properly when there is enough desktop area to use them side by side) it is crippling on even medium-reslution single displays since it makes Tiled only useable with the tilesets window docked. (This forces an unworkable amount of scrolling on lower-resolution displays.)

Reproduce the undocked tilesets window behavior on OSX 10.9 with a single monitor, including switching between overlapping editor and tilesets windows and moving the tilesets window to another space. Trace the window-management behavior and consider the issue done when the editor can return to the foreground and the undocked tilesets window can be used across spaces without requiring multiple displays.

Written by the indexing model from the issue text.