* Generic upstream bugs

- optional defines aren't really optional and lead to compilation
  errors/warnings
- typo: NK_EDIT_COMMITED

* UI bugs

- dragging can change what widget is dragged currently...
- wrapped text not displayed in popup
- when you resize a window to be as small as possible, several things
  happen (as demonstrated in the overview demo):
  - text overflow
  - scrollbar overflow
  - widget overlap (window flag checkboxes)
- overview demo: enabled scrollbar takes space even when not visible
- checkbox state is not obvious (why no x or at least more padding
  like with options?)
- resizing triangle could use a more forgiving hitbox (dragging by the
  border does *not* work)
- edit box behaves weirdly (cursor form changes depending where you
  click, typing lots makes the text go invisible except for the end)
- more repeatable behavior please! (edit box, combo box properties)
- allow for overshoot (like when dragging beyond the end of a
  progressbar)
- allow for click in empty scrollbar area
- resizer disappears when opening any combobox
- combo box can only be closed by clicking space outside it (as
  opposed to clicking on the picked item)
- slider does not get adjusted when clicking on another location, only
  by dragging

* Demo bugs

- X button in demos does respawn them...
- dead code in node editor demo (selected)
- node editor grid moves into the other direction when dragging
  top-level window
- silly/wrong labelf usage in overview demo
- second/minute upper bounds are wrong in overview demo
- typos in month names in overview demo
- bounds mostly unused in charts in overview demo
- line_index not used in first chart example (as opposed to second)
- typos in popup in overview demo
- "Group_buttom"
- NK_WINDOW_NO_SCROLLBAR used twice in vsplit part of overview demo

* Wishlist items

- documentation (on widget/layout behavior please, not reiterating
  function signatures)
- the level of detail for that commentary should be comparable to the
  combobox comment in overview.c
- backend image support (currently there's only lots of opengl3
  boilerplate code in the example directory)
- code with multiple option widgets is hard to read and pretty much
  requires enums or numeric bools (which are not a Scheme thing...)

* Egg changes

- add more (user) error handling
- consider defining tunable for button triggering (on key up)
- make more widgets return multiple values
- add predicates and record printers