Removed GetWindowContentRegionWidth() function

imgui.cpp

@@ -376,6 +376,7 @@ CODE
  When you are not sure about an old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2021/08/23 (1.85) - removed GetWindowContentRegionWidth() function. keep inline redirection helper. can use 'GetWindowContentRegionMax().x - GetWindowContentRegionMin().x' instead.
  - 2021/07/26 (1.84) - commented out redirecting functions/enums names that were marked obsolete in 1.67 and 1.69 (March 2019):
                         - ImGui::GetOverlayDrawList() -> use ImGui::GetForegroundDrawList()
                         - ImFont::GlyphRangesBuilder  -> use ImFontGlyphRangesBuilder
@@ -6618,7 +6619,7 @@ void ImGui::PopItemFlag()
 }
 
 // BeginDisabled()/EndDisabled()
-// - Those can be nested but this cannot be used to enable an already disabled section (a single BeginDisabled(true) in the stack is enough to keep things disabled)
+// - Those can be nested but it cannot be used to enable an already disabled section (a single BeginDisabled(true) in the stack is enough to keep everything disabled)
 // - Visually this is currently altering alpha, but it is expected that in a future styling system this would work differently.
 // - Feedback welcome at https://github.com/ocornut/imgui/issues/211
 // - BeginDisabled(false) essentially does nothing useful but is provided to facilitate use of boolean expressions. If you can avoid calling BeginDisabled(False)/EndDisabled() best to avoid it.
@@ -7416,7 +7417,6 @@ void ImGuiStackSizes::CompareWithCurrentState()
 // - GetContentRegionMaxAbs() [Internal]
 // - GetContentRegionAvail(),
 // - GetWindowContentRegionMin(), GetWindowContentRegionMax()
-// - GetWindowContentRegionWidth()
 // - BeginGroup()
 // - EndGroup()
 // Also see in imgui_widgets: tab bars, columns.
@@ -7784,12 +7784,6 @@ ImVec2 ImGui::GetWindowContentRegionMax()
     return window->ContentRegionRect.Max - window->Pos;
 }
 
-float ImGui::GetWindowContentRegionWidth()
-{
-    ImGuiWindow* window = GImGui->CurrentWindow;
-    return window->ContentRegionRect.GetWidth();
-}
-
 // Lock horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
 // Groups are currently a mishmash of functionalities which should perhaps be clarified and separated.
 void ImGui::BeginGroup()