ColorPicker: Fix not being able to pick exactly (1.0f, 1.0f, 1.0f) color by dragging toward the edges of the SV square. (#3517)

Old code attempted to mitigate hue/saturation resetting for colors where these components are undefined. Since we now explicitly back up and restore these components this workaround is no longer necessary.

docs/CHANGELOG.txt

@@ -67,6 +67,8 @@ Other Changes:
 - ColorEdit4: Fixed hue resetting to 0 when it is set to 255. [@rokups]
 - ColorEdit4: Fixed hue value jitter when source color is stored as RGB in 32-bit integer and perform
   RGB<>HSV round trips every frames. [@rokups]
+- ColorPicker4: Fixed picker being unable to select exact 1.0f color when dragging toward the edges
+  of the SV square (previously picked 0.999989986f). (#3517) [@rokups]
 - Menus: Fixed vertical alignments of MenuItem() calls within a menu bar. (broken in 1.84). (#4538)
 - Menus: Adjust closing logic to accomodate for varying font size and dpi.
 - Menus: Fixed crash when navigating left inside a child window inside a sub-menu. (#4510).

imgui_widgets.cpp

@@ -5260,7 +5260,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     {
         if (flags & ImGuiColorEditFlags_InputRGB)
         {
-            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]);
+            ColorConvertHSVtoRGB(H, S, V, col[0], col[1], col[2]);
             g.ColorEditLastHue = H;
             g.ColorEditLastSat = S;
             g.ColorEditLastColor = ColorConvertFloat4ToU32(ImVec4(col[0], col[1], col[2], 0));