merge: pull request #64 from sonoro1234/ImGuiColorEditFlags_AlphaPreview

Fix ImGuiColorEditFlags_AlphaPreview disappearing after ImGui 19173

Author: brenocq

implot3d_demo.cpp

@@ -973,6 +973,7 @@ void ShowStyleEditor(ImPlot3DStyle* ref) {
             filter.Draw("Filter colors", ImGui::GetFontSize() * 16);
 
             static ImGuiColorEditFlags alpha_flags = ImGuiColorEditFlags_AlphaPreviewHalf;
+#if IMGUI_VERSION_NUM < 19173
             if (ImGui::RadioButton("Opaque", alpha_flags == ImGuiColorEditFlags_None))
                 alpha_flags = ImGuiColorEditFlags_None;
             ImGui::SameLine();
@@ -982,6 +983,17 @@ void ShowStyleEditor(ImPlot3DStyle* ref) {
             if (ImGui::RadioButton("Both", alpha_flags == ImGuiColorEditFlags_AlphaPreviewHalf))
                 alpha_flags = ImGuiColorEditFlags_AlphaPreviewHalf;
             ImGui::SameLine();
+#else
+            if (ImGui::RadioButton("Opaque", alpha_flags == ImGuiColorEditFlags_AlphaOpaque))      
+                alpha_flags = ImGuiColorEditFlags_AlphaOpaque;
+            ImGui::SameLine();
+            if (ImGui::RadioButton("Alpha",  alpha_flags == ImGuiColorEditFlags_None))
+                alpha_flags = ImGuiColorEditFlags_None;
+            ImGui::SameLine();
+            if (ImGui::RadioButton("Both",   alpha_flags == ImGuiColorEditFlags_AlphaPreviewHalf))
+                alpha_flags = ImGuiColorEditFlags_AlphaPreviewHalf;
+            ImGui::SameLine();
+#endif
             HelpMarker(
                 "In the color list:\n"
                 "Left-click on color square to open color picker,\n"