Style Editor: disable FontScaleDpi field when io.ConfigDpiScaleFonts is set.

Amend d85e22d20

imgui_demo.cpp

diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 9bdce3c..7cbcf7f 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -8499,10 +8499,10 @@
             style._NextFrameFontSizeBase = style.FontSizeBase; // FIXME: Temporary hack until we finish remaining work.
         SameLine(0.0f, 0.0f); Text(" (out %.2f)", GetFontSize());
         DragFloat("FontScaleMain", &style.FontScaleMain, 0.02f, 0.5f, 4.0f);
-        //BeginDisabled(GetIO().ConfigDpiScaleFonts);
+        BeginDisabled(GetIO().ConfigDpiScaleFonts);
         DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 4.0f);
-        //SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.");
-        //EndDisabled();
+        SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.");
+        EndDisabled();
 
         // Simplified Settings (expose floating-pointer border sizes as boolean representing 0.0f or 1.0f)
         if (SliderFloat("FrameRounding", &style.FrameRounding, 0.0f, 12.0f, "%.0f"))