Clipper: add ForceDisplayRangeByIndices (#3841, #3578)

This partially reverts commit 6a7e2c74fb.

docs/CHANGELOG.txt

@@ -57,9 +57,11 @@ Other Changes:
 - 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]
+- Cliooer: added ForceDisplayRangeByIndices() to force a given item (or several) to be stepped out
+  during a clipping operation. (#3841) [@@GamingMinds-DanielC]
 - 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.
+- Clipper: fixed content height declaration slightly mismatching the value of when not using a clipper.
   (an additional ItemSpacing.y was declared, affecting scrollbar range).
 - 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

docs/TODO.txt

@@ -142,7 +142,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - plot: option/feature: draw unit
  - plot: add a helper e.g. Plot(char* label, float value, float time_span=2.0f) that stores values and Plot them for you - probably another function name. and/or automatically allow to plot ANY displayed value (more reliance on stable ID)
 
- - clipper: ability to force display 1 item in the list would be convenient (for patterns where we need to set active id etc.) (#3841) (can resurrect ForceDisplayRangeXXX functions removed)
  - clipper: ability to disable the clipping through a simple flag/bool.
  - clipper: ability to run without knowing full count in advance.
  - clipper: horizontal clipping support. (#2580)