What I expected to happen was for the button to stay disabled as it is, therefore, causing the world to never be created.
What actually happened was that the button got re-enabled.
Steps To Reproduce:
1. Click on "Singleplayer".
2. Click on "Create New World".
3. Remove the entire world name from the box, so that the button "Create New World" gets disabled.
4. Resize the window.
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Confirmed.
If pressed, the world is created with the name World

Confirmed for 14w25 and 14w26.

Can anyone else confirm if this is still occuring?
My computer is currently undergoing an "operation" (motherboard needs to be replaced)

Still in 14w34c

Still in 1.8-pre?

Confirmed (1.8). Also related to MC-54551.

Still in 1.8.1-pre3. Pressing any key (ctrl, alt, esc, backspace etc.) fixes the issue.

Confirmed for 15w32a.