Split the todo.md file into one for immediate TODOs and one for future work; merged the latter with controlcandidates.md to form a single future stuff list. Also cleaned up all those lists.

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-WINDOWS
-- DateTime Picker
-- ListView for Tables
-- either Property Sheets or Tabs for Tabs
-- either Rebar or Toolbar for Toolbars
-- Status Bar
-- Tooltip (should be a property of each control)
-- Trackbar for Sliders
-	- cannot automatically snap to custom step; need to do it manually
-- Tree View
-- Up-Down Control for Spinners
-- maybe:
-	- swap ComboBox for ComboBoxEx (probably only if requested enough)
-	- IP Address control (iff GTK+ and Cocoa have it; maybe not necessary if we allow arbitrary target addresses?)
-	- ListView for its Icon View?
-	- something similar to Task Dialog might be useful to have as a convenience template later
-- TODO
-	- commcntl.h has stuff on a font control that isn't documented?
-		- actually not a control, but localization support: http://msdn.microsoft.com/en-us/library/windows/desktop/bb775454%28v=vs.85%29.aspx
-- notes to self:
-	- OpenGL: http://msdn.microsoft.com/en-us/library/windows/desktop/dd374379%28v=vs.85%29.aspx
-	- don't use ES_NUMBER for number-only text boxes, as "it is still possible to paste non-digits into the edit control." (though a commenter on MSDN says that's wrong?)
-		- might want to just have spinners and not numeric text boxes???
-
-GTK+
-- GtkCalendar for date selection (TODO doesn't handle times)
-- GtkNotebook for Tabs
-- GtkScale for Sliders
-	- cannot automatically snap to INTEGERS (let alone to custom steps); need to do it manually
-	- natural size is 0x0 for some reason
-- GtkSpinButton for Spinners
-- GtkStatusBar
-- GtkToolbar
-- maybe:
-	- GtkFontButton would be nice but unless ComboBoxEx provides it Windows doesn't
-		- same for GtkColorButton
-	- GtkIconView
-	- GtkSeparator (I think Windows makes this a mode of Static controls?)
-- notes to self:
-	- groupbox is GtkFrame
-	- GtkTreeView can do tree views and Tables
-	- OpenGL is done outside GTK+: https://projects.gnome.org/gtkglext/
-		- only an issue if I want to provide OpenGL by default...
-		- http://stackoverflow.com/questions/3815806/gtk-and-opengl-bindings suggest GtkGLArea is better but that seems to be a Mono thing? also indicates Clutter (with its Cogl) is not an option because it locks you out of using the OpenGL API directly
-			- er no, the Mono thing is just the homepage... but it doesn't say if this targets GTK+ 2 or GTK+ 3, hm. (also it appears to not have been updated since Precise; in Ubuntu it's libgtkgl)
-			- and gtkglext doesn't support GTK+ 3 officially anyway
-			- and cairo doesn't seem to support OpenGL explicitly so it looks like I will need to communicate with glx directly: http://stackoverflow.com/questions/17628241/how-can-i-use-gtk3-and-opengl-together
-				- except replace glx with EGL/GLES2 because of Wayland: http://wayland.freedesktop.org/faq.html#heading_toc_j_0 (assuming EGL/GLES2 can work on X11)
-
-COCOA
-- NSDatePicker for date/time selection
-- NSOutlineView for tree views
-- NSSlider for Sliders
-- NSStatusBar
-- NSStepper for Spinners
-	- TODO does this require me to manually pair it with a single-line text entry field?
-- NSTabView for Tabs
-- NSTableView for Tables
-- NSToolbar
-- maybe:
-	- NSBrowser seems nice...???
-	- NSCollectionView for Icon View?
-	- NSColorWell is the color button
-	- NSOpenGLView for OpenGL; need to see how much OpenGL-specific stuff I need to expose
-	- NSRuleEditor/NSPredicateEditor look nice too but
-- notes to self:
-	- groupbox is NSBox
-	- don't look at NSForm; though it arranges in the ideal form layout, it only allows single-line text entry fields as controls
-- TODO:
-	- what does NSPathControl look like?
-
-# Slider Capabilities
-Capability | Windows | GTK+ | Cocoa
------ | ----- | ----- | -----
-Data Type | int | float | float
-Can Simulate ints? | yes | TODO | TODO
-Mouse Step Snap | 1, fixed | something; likely 0.1 but not sure | yes (`setAllowsTickMarkValuesOnly:`); caveat: must specify an exact number of ticks (see below)
-Keyboard Step Snap | configurable | configurable | TODO (same as mouse?)
-Current Value Display | tooltip during drag | label, always visible | TODO
-Tooltips? | TODO | TODO | TODO
-Ticks | configurable display, configurable interval | TODO | configurable display; configurable COUNT (not interval!)
-Can Catch Mouse Events to Snap? | I think this is how to do it | TODO | TODO
-Preferred Size | given in UI guidelines | natural: 0x0; minimum: TODO | TODO
-
-# Spinner Capabilities
-Capability | Windows | GTK+ | Cocoa
------ | ----- | ----- | -----
-Data Type | int | float | flaot
-Can Simulate ints? | yes | yes | TODO
-Mouse Step Snap | 1, fixed | configurable | configurable
-Keyboard Step Snap | 1, fixed | configurable (uses same value as mouse) | TODO (same as mouse?)
-Can Catch Events To Snap? | TODO | no need | TODO
-Preferred Size | TODO | TODO | TODO
-
-
-# Dialog box hijack
-## Open/Save Dialogs
-  | Windows | GTK+ | Cocoa
------ | ----- | ----- | -----
-Directories | no (separate facility provided by the shell) | open and save | open only
-Network vs. local only (URI vs. filename) | Network button enabled by default; can be switched off (**TODO** how are network filenames returned?) | yes (default local only; if local only, changing to, say, smb://127.0.0.1/ will pop up an error box; if nonlocal allowed, filename can be null) | xxx
-Multiple selection | yes | yes | open only
-Hidden files | user-specified; can be switched on in code (but is a no-op?) | hidden by default; can be switched on in code (but is a no-op?) and also by the user | xxx
-Overwrite confirmation | available; must be explicitly enabled | available; must be explicitly enabled | xxx
-New Folder button | xxx | optional (I think enabled by default? should do it explicitly to be safe, anyway) | optional
-Preview widget | xxx | yes; optional, custom | xxx
-Extra custom widget | xxx | yes; optional | yes; optional
-File filters | Specified by "patterns" (consisting of filename characters and * but not space; I assume the only safe ones are *.ext and *.*); multiple patterns separated by semicolons; can have custom labels | Specified by MIME type (handles subtypes; has wildcards) or pattern ("shell-style glob", so I assume over whole basename) or by custom function; can have multiple of the above; can have custom labels; also has a shortcut to add all gdk-pixbuf-supported formats | Specified by "UTI"s or by individual filename extensions (format not documented but appears to be just the extension without embellishments); cannot have labels; 1:1 filter:extension mapping.
-File filter list format | `"Label\0Filter-list\0Label\0Filter-list\0...Label\0FIlter-list\0\0"`; filter for all files is canonically `"All Files\0*.*\0\0"` in the docs (specifically this due to handling of shortcut links); also provides a way for users to write in their own filters | Add or remove individual GtkFileFIlter objects; can select one specified in the list to show by default; default behavior is all files; if selected one when none has been specified, filter selection disabled; filter for all files specified in docs under gtk_file_filter_new() (except doesn't set a name) | NSArray of filter strings, or nil for All Files. There is no provision to have an "all files" option: you either specify a set of filters or you don't. (See filename extension auto-append below.). All filters are applied at once; there is no way to select. We might need to introduce an accessory panel (extra widget) to fake the filtering rules of other platforms...
-Default file name | settable | settable | settable (as the filename label)
-Initial directory | complex rules that have changed over time; we can pass an absolute filename (the previous filename or a default filename) and have its path used (if we specify just a path it will either be used as the filename or the program will crash); or we can give it a directory; or Windows will remember for us for some time, or... | pass previous filename or URI to show; overrides default file name; intended only for saving files (so I don't know if it's possible to remember current directory for opening??????); effect of passing containing directory undocumented(???? in my tests the given folder itself is selected) | has some rules; there is a way to specify a custom one; seems to have the undocumented effect that it selects the file if a file is named
-Confirmation and cancel buttons | xxx | GTK_STOCK_OPEN, GTK_STOCK_SAVE, GTK_STOCK_SAVE_AS / GTK_STOCK_CANCEL | cancel button predefined; confirmation button can be changed (setPrompt:) but **TODO** the docs imply prompt is actually a global property?
-Returned filename rules | xxxx | memory provided by GTK+ itself (so no need to worry about size limits); can return a single filename or URI or a GSList of filenames or URIs | xxx
-Window title | optional; defaults to either Open or Save As | required(?) | optional for save (defaults to Save); unknown (**TODO**) for Open
-Prompt to create new files | available; must be explicitly enabled; seems to only apply to Open File dialogs (**TODO**) | xxx | xxx
-Adds file to a Recent Documents list | available; must be explicitly disabled | xxx | xxx
-Allows nonexistent files to be created in Open dialogs | yes; can be switched off | xxx | xxx
-"Open as read-only"/"Save as read-only" checkbox | provided; default; can be switched off | xxx | xxx
-Navigating changes the current working directory of the program | yes; can be switched off for Save dialogs only (????) | xxx | xxx
-Link following | For .lnk files, enabled by default iff a filter is specified; the All Files filter above is listed as being necessary to follow links; can be shut off with a flag in all cases | xxx | For Finder aliases, setResolvesAliases:
-Help button | Available; old-style dialog boxes need a parent window (Explorer-style ones don't; they just need a hook function) | xxx | xxx
-Extension auto-appending | Optional; three-character maximum; doesn't seem to be available on a per-filter basis | xxx | **NOT OPTIONAL.** The only way to avoid this is to not specify any filters. You can't even circumvent this with a delegate. If the user specifies another extension, they are asked to choose one if setAllowsOtherFileTypes: is set. (**TODO** could we use nameFieldStringValue to circumvent?)
-Other labels | xxx | xxx | field before filename entry can be changed; also can provide an additional optional message
-Multiple selection allows empty selection | xxx | xxx | xxx
-
-TODO
-* Windows: OFN_NOTESTFILECREATE might be necessary
-* Windows: OFN_NOVALIDATE - see what happens without a hook
-* Windows: OFN_SHAREAWARE - this is a weird one but it's network related
-* Windows: templates seem to be how to provide extra parameters, but their usage isn't documented on the OPENFILENAME struct help page; check the rest of MSDN
-* Mac OS X: turn on both setExtensionHidden: and setCanSelectHiddenExtension: to show the extnesion in the dialog
-* Mac OS X: turn on setTreatsFilePackagesAsDirectories: since file packages (bundles) are an OS X-specific concept