Nav, Tabbing: refactor tabbing system to support clipped items, scrol…

…ling, using nav queries. (ocornut#4449)

Not using counter/modulo anymore and special provisions to handle tab wrapping with ImGuiListClipper. Wrapping may be done better as a next-frame forwarded request.
Also one extra step toward ocornut#3949 ocornut#3985

docs/CHANGELOG.txt

@@ -44,23 +44,23 @@ Other Changes:
 - Added IsMouseTripleClicked() function. Tracking multi-click count in IO structure. (#3229) [@kudaba]
 - Modals: fixed issue hovering popups inside a child inside a modal. (#4676, #4527)
 - Fixed IsWindowFocused()/IsWindowHovered() issues with childs inside popups. (#4676)
+- Nav: tabbing now cycles through clipped items and scroll accordingly. (#4449)
+- Nav: pressing PageUp/PageDown/Home/End when in Menu layer automatically moves back to Main layer.
+- Nav: fixed resizing window from borders setting navigation to Menu layer.
+- Nav: pressing Esc to exit a child window reactivates the Nav highlight if it was disabled by mouse.
+- Nav: with ImGuiConfigFlags_NavEnableSetMousePos enabled: Fixed absolute mouse position when using
+  Home/End leads to scrolling. Fixed not setting mouse position when a failed move request (e.g. when
+  already at edge) reactivates the navigation highlight.
+- InputText, Nav: fixed repeated calls to SetKeyboardFocusHere() preventing to use InputText(). (#4682)
+- InputText: made double-click select word, triple-line select line. Word delimitation logic differs
+  slightly from the one used by CTRL+arrows. (#2244)
 - Clipper: currently focused item is automatically included in clipper range.
   Fixes issue where e.g. drag and dropping an item and scrolling ensure the item source location is
   still submitted. (#3841, #1725) [@GamingMinds-DanielC, @ocornut]
 - Clipper: rework so gamepad/keyboard navigation doesn't create spikes in number of items requested
   by the clipper to display. (#3841)
 - Clipper: Fixed content height declaration slightly mismatching the value of when not using a clipper.
   (an additional ItemSpacing.y was declared, affecting scrollbar range).
-- InputText, Nav: fixed repeated calls to SetKeyboardFocusHere() preventing to use InputText(). (#4682)
-- Nav: pressing PageUp/PageDown/Home/End when in Menu layer automatically moves back to Main layer.
-- Nav: fixed resizing window from borders setting navigation to Menu layer.
-- Nav: pressing Esc to exit a child window reactivates the Nav highlight if it was disabled by mouse.
-- Nav: (with ImGuiConfigFlags_NavEnableSetMousePos): fixed absolute mouse position when using Home/End
-  leads to scrolling.
-- Nav: (with ImGuiConfigFlags_NavEnableSetMousePos): fixed not setting mouse position when a failed
-  move request (e.g. already at edge) reactivate the navigation highlight.
-- InputText: made double-click select word, triple-line select line. Word delimitation logic differs
-  slightly from the one used by CTRL+arrows. (#2244)
 - Backends: Vulkan: Call vkCmdSetScissor() at the end of render with a full-viewport to reduce
   likehood of issues with people using VK_DYNAMIC_STATE_SCISSOR in their app without calling
   vkCmdSetScissor() explicitly every frame. (#4644)

docs/TODO.txt

@@ -341,7 +341,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - nav: NavFlattened: broken: in typical usage scenario, the items of a fully clipped child are currently not considered to enter into a NavFlattened child.
  - nav: NavFlattened: cannot access menu-bar of a flattened child window with Alt/menu key (not a very common use case..).
  - nav: simulate right-click or context activation? (SHIFT+F10)
- - nav/tabbing: refactor old tabbing system and turn into navigation, should pass through all widgets (in submission order?).
  - nav/popup: esc/enter default behavior for popups, e.g. be able to mark an "ok" or "cancel" button that would get triggered by those keys, default validation button, etc.
  - nav/treenode: left within a tree node block as a fallback (ImGuiTreeNodeFlags_NavLeftJumpsBackHere by default?)
  - nav/menus: pressing left-right on a vertically clipped menu bar tends to jump to the collapse/close buttons.