Docs: added more references to IsKeyDown(), InFlags. (#8317)

Author: ocornut

docs/CHANGELOG.txt

@@ -153,11 +153,12 @@ Decorated log and release notes: https://github.com/ocornut/imgui/releases/tag/v
 Breaking changes:
 
 - Commented out pre-1.87 IO system (equivalent to using IMGUI_DISABLE_OBSOLETE_KEYIO or IMGUI_DISABLE_OBSOLETE_FUNCTIONS before).
-  - io.KeyMap[] and io.KeysDown[] are removed (obsoleted February 2022).
+  - io.KeyMap[] and io.KeysDown[] are removed (obsoleted February 2022). Use IsKeyDown() instead.
   - io.NavInputs[] and ImGuiNavInput are removed (obsoleted July 2022).
   - Pre-1.87 backends are not supported:
     - backends need to call io.AddKeyEvent(), io.AddMouseEvent() instead of writing to io.KeysDown[], io.MouseDown[] fields.
     - backends need to call io.AddKeyAnalogEvent() for gamepad values instead of writing to io.NavInputs[] fields.
+    - you can use IsKeyDown() instead of reading from io.KeysDown[].
   - For more references:
     - read 1.87 and 1.88 part of API BREAKING CHANGES in imgui.cpp or read Changelog for 1.87 and 1.88.
     - read https://github.com/ocornut/imgui/issues/4921
@@ -2390,6 +2391,7 @@ Breaking Changes:
   - For all calls to IO new functions, the Dear ImGui context should be bound/current.
 - Reworked IO keyboard input API: (#4921, #2625, #3724) [@thedmd, @ocornut]
   - Added io.AddKeyEvent() function, obsoleting writing directly to io.KeyMap[], io.KeysDown[] arrays.
+  - You can use IsKeyDown() instead of reading from io.KeysDown[].
   - For keyboard modifiers, you can call io.AddKeyEvent() with ImGuiKey_ModXXX values,
     obsoleting writing directly to io.KeyCtrl, io.KeyShift etc.
   - Added io.SetKeyEventNativeData() function (optional) to pass native and old legacy indices.

imgui.cpp

@@ -647,7 +647,7 @@ CODE
                         - Backend writing to io.MouseHoveredViewport   -> backend should call io.AddMouseViewportEvent() [Docking branch w/ multi-viewports only]
                        note: for all calls to IO new functions, the Dear ImGui context should be bound/current.
                        read https://github.com/ocornut/imgui/issues/4921 for details.
- - 2022/01/10 (1.87) - inputs: reworked keyboard IO. Removed io.KeyMap[], io.KeysDown[] in favor of calling io.AddKeyEvent(). Removed GetKeyIndex(), now unnecessary. All IsKeyXXX() functions now take ImGuiKey values. All features are still functional until IMGUI_DISABLE_OBSOLETE_KEYIO is defined. Read Changelog and Release Notes for details.
+ - 2022/01/10 (1.87) - inputs: reworked keyboard IO. Removed io.KeyMap[], io.KeysDown[] in favor of calling io.AddKeyEvent(), ImGui::IsKeyDown(). Removed GetKeyIndex(), now unnecessary. All IsKeyXXX() functions now take ImGuiKey values. All features are still functional until IMGUI_DISABLE_OBSOLETE_KEYIO is defined. Read Changelog and Release Notes for details.
                         - IsKeyPressed(MY_NATIVE_KEY_XXX)              -> use IsKeyPressed(ImGuiKey_XXX)
                         - IsKeyPressed(GetKeyIndex(ImGuiKey_XXX))      -> use IsKeyPressed(ImGuiKey_XXX)
                         - Backend writing to io.KeyMap[],io.KeysDown[] -> backend should call io.AddKeyEvent() (+ call io.SetKeyEventNativeData() if you want legacy user code to stil function with legacy key codes).

imgui_internal.h

@@ -1247,11 +1247,11 @@ struct ImGuiNextItemData
 struct ImGuiLastItemData
 {
     ImGuiID                 ID;
-    ImGuiItemFlags          ItemFlags;          // See ImGuiItemFlags_
+    ImGuiItemFlags          ItemFlags;          // See ImGuiItemFlags_ (called 'InFlags' before v1.91.4).
     ImGuiItemStatusFlags    StatusFlags;        // See ImGuiItemStatusFlags_
     ImRect                  Rect;               // Full rectangle
     ImRect                  NavRect;            // Navigation scoring rectangle (not displayed)
-    // Rarely used fields are not explicitly cleared, only valid when the corresponding ImGuiItemStatusFlags ar set.
+    // Rarely used fields are not explicitly cleared, only valid when the corresponding ImGuiItemStatusFlags are set.
     ImRect                  DisplayRect;        // Display rectangle. ONLY VALID IF (StatusFlags & ImGuiItemStatusFlags_HasDisplayRect) is set.
     ImRect                  ClipRect;           // Clip rectangle at the time of submitting item. ONLY VALID IF (StatusFlags & ImGuiItemStatusFlags_HasClipRect) is set..
     ImGuiKeyChord           Shortcut;           // Shortcut at the time of submitting item. ONLY VALID IF (StatusFlags & ImGuiItemStatusFlags_HasShortcut) is set..