Renaming + missing initialization + missing Changelog update.

docs/CHANGELOG.txt

@@ -65,6 +65,9 @@ Other Changes:
 - Inputs: Added ImGuiMouseButton enum for convenience (e.g. ImGuiMouseButton_Right=1).
   We forever guarantee that the existing value will not changes so existing code is free to use 0/1/2.
 - ColorEdit: Fix label alignment when using ImGuiColorEditFlags_NoInputs. (#2955) [@rokups]
+- ColorEdit: In HSV display of a RGB stored value, attempt to locally preserve Saturation
+  when Value==0.0 (similar to changes done in 1.73 for Hue). Removed Hue editing lock since
+  those improvements in 1.73 makes them unnecessary. (#2722, #2770). [@rokups]
 - Misc: Added ImGuiMouseCursor_NotAllowed enum so it can be used by more shared widgets. [@rokups]
 - ImDrawList: Add AddNgon(), AddNgonFilled() API with a guarantee on the explicit segment count.
   In the current branch they are essentially the same as AddCircle(), AddCircleFilled() but as
@@ -75,11 +78,11 @@ Other Changes:
 - Backends: SDL: Wayland: use SDL_GetMouseState (because there is no global mouse state available
   on Wayland). (#2800, #2802) [@NeroBurner]
 - Examples: Explicitly adding -DIMGUI_IMPL_OPENGL_LOADER_GL3W to Makefile to match linking
-  settings (otherwise if another loader such as Glew is accessible, the opengl3 backend might
-  automatically use it). [#2919, #2798]
+  settings (otherwise if another loader such as Glew is accessible, the OpenGL3 backend might
+  automatically use it). (#2919, #2798)
 - Examples: Metal: Wrapped main loop in @autoreleasepool block to ensure allocations get freed
-  even if underlying system event loop gets paused due to app nap (#2910, #2917). [@bear24rw]
-- Examples: Added support for glbindings OpenGL loader.
+  even if underlying system event loop gets paused due to app nap. (#2910, #2917) [@bear24rw]
+- Examples: Added support for glbindings OpenGL loader. (#2870) [@rokups]
 
 
 -----------------------------------------------------------------------
@@ -164,7 +167,7 @@ Other Changes:
 - Nav, Scrolling: Added support for Home/End key. (#787)
 - ColorEdit: Disable Hue edit when Saturation==0 instead of letting Hue values jump around.
 - ColorEdit, ColorPicker: In HSV display of a RGB stored value, attempt to locally preserve Hue
-  when Saturation==0, which reduces accidentally lossy interactions. (#2722, 2770) [@rokups]
+  when Saturation==0, which reduces accidentally lossy interactions. (#2722, #2770) [@rokups]
 - ColorPicker: Made rendering aware of global style alpha of the picker can be faded out. (#2711)
   Note that some elements won't accurately fade down with the same intensity, and the color wheel
   when enabled will have small overlap glitches with (style.Alpha < 1.0).

imgui_internal.h

@@ -1121,7 +1121,7 @@ struct ImGuiContext
     ImGuiID                 TempInputTextId;                    // Temporary text input when CTRL+clicking on a slider, etc.
     ImGuiColorEditFlags     ColorEditOptions;                   // Store user options for color edit widgets
     float                   ColorEditLastHue;                   // Backup of last Hue associated to LastColor[3], so we can restore Hue in lossy RGB<>HSV round trips
-    float                   ColorEditLastSaturation;            // Backup of last Saturation associated to LastColor[3], so we can restore Saturation in lossy RGB<>HSV round trips
+    float                   ColorEditLastSat;                   // Backup of last Saturation associated to LastColor[3], so we can restore Saturation in lossy RGB<>HSV round trips
     float                   ColorEditLastColor[3];
     ImVec4                  ColorPickerRef;                     // Initial/reference color at the time of opening the color picker.
     bool                    DragCurrentAccumDirty;
@@ -1266,7 +1266,7 @@ struct ImGuiContext
         LastValidMousePos = ImVec2(0.0f, 0.0f);
         TempInputTextId = 0;
         ColorEditOptions = ImGuiColorEditFlags__OptionsDefault;
-        ColorEditLastHue = 0.0f;
+        ColorEditLastHue = ColorEditLastSat = 0.0f;
         ColorEditLastColor[0] = ColorEditLastColor[1] = ColorEditLastColor[2] = FLT_MAX;
         DragCurrentAccumDirty = false;
         DragCurrentAccum = 0.0f;

imgui_widgets.cpp

@@ -4227,7 +4227,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
             if (f[1] == 0)
                 f[0] = g.ColorEditLastHue;
             if (f[2] == 0)
-                f[1] = g.ColorEditLastSaturation;
+                f[1] = g.ColorEditLastSat;
         }
     }
     int i[4] = { IM_F32_TO_INT8_UNBOUND(f[0]), IM_F32_TO_INT8_UNBOUND(f[1]), IM_F32_TO_INT8_UNBOUND(f[2]), IM_F32_TO_INT8_UNBOUND(f[3]) };
@@ -4358,7 +4358,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
         if ((flags & ImGuiColorEditFlags_DisplayHSV) && (flags & ImGuiColorEditFlags_InputRGB))
         {
             g.ColorEditLastHue = f[0];
-            g.ColorEditLastSaturation = f[1];
+            g.ColorEditLastSat = f[1];
             ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
             memcpy(g.ColorEditLastColor, f, sizeof(float) * 3);
         }
@@ -4546,7 +4546,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             if (S == 0)
                 H = g.ColorEditLastHue;
             if (V == 0)
-                S = g.ColorEditLastSaturation;
+                S = g.ColorEditLastSat;
         }
     }
     else if (flags & ImGuiColorEditFlags_InputHSV)
@@ -4675,7 +4675,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
         {
             ColorConvertHSVtoRGB(H >= 1.0f ? H - 10 * 1e-6f : H, S > 0.0f ? S : 10*1e-6f, V > 0.0f ? V : 1e-6f, col[0], col[1], col[2]);
             g.ColorEditLastHue = H;
-            g.ColorEditLastSaturation = S;
+            g.ColorEditLastSat = S;
             memcpy(g.ColorEditLastColor, col, sizeof(float) * 3);
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)
@@ -4735,7 +4735,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
                 if (S == 0)
                     H = g.ColorEditLastHue;
                 if (V == 0)
-                    S = g.ColorEditLastSaturation;
+                    S = g.ColorEditLastSat;
             }
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)