ColorPicker4: Fixed returning true when holding mouse button on the sat/value/alpha locations. (#1489)

imgui.cpp

@@ -9883,7 +9883,7 @@ void ImGui::ColorEditOptionsPopup(const float* col, ImGuiColorEditFlags flags)
     EndPopup();
 }
 
-static void ColorPickerOptionsPopup(ImGuiColorEditFlags flags, float* ref_col)
+static void ColorPickerOptionsPopup(ImGuiColorEditFlags flags, const float* ref_col)
 {
     bool allow_opt_picker = !(flags & ImGuiColorEditFlags__PickerMask);
     bool allow_opt_alpha_bar = !(flags & ImGuiColorEditFlags_NoAlpha) && !(flags & ImGuiColorEditFlags_AlphaBar);
@@ -10167,6 +10167,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
         flags |= (g.ColorEditOptions & ImGuiColorEditFlags_AlphaBar);
 
     // Setup
+    int components = (flags & ImGuiColorEditFlags_NoAlpha) ? 3 : 4;
     bool alpha_bar = (flags & ImGuiColorEditFlags_AlphaBar) && !(flags & ImGuiColorEditFlags_NoAlpha);
     ImVec2 picker_pos = window->DC.CursorPos;
     float square_sz = SmallSquareSize();
@@ -10176,6 +10177,9 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     float bar1_pos_x = bar0_pos_x + bars_width + style.ItemInnerSpacing.x;
     float bars_triangles_half_sz = (float)(int)(bars_width * 0.20f);
 
+    float backup_initial_col[4];
+    memcpy(backup_initial_col, col, components * sizeof(float));
+
     float wheel_thickness = sv_picker_size * 0.08f;
     float wheel_r_outer = sv_picker_size * 0.50f;
     float wheel_r_inner = wheel_r_outer - wheel_thickness;
@@ -10291,7 +10295,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             ImVec4 ref_col_v4(ref_col[0], ref_col[1], ref_col[2], (flags & ImGuiColorEditFlags_NoAlpha) ? 1.0f : ref_col[3]);
             if (ColorButton("##original", ref_col_v4, (flags & (ImGuiColorEditFlags_HDR|ImGuiColorEditFlags_AlphaPreview|ImGuiColorEditFlags_AlphaPreviewHalf|ImGuiColorEditFlags_NoTooltip)), ImVec2(square_sz * 3, square_sz * 2)))
             {
-                memcpy(col, ref_col, ((flags & ImGuiColorEditFlags_NoAlpha) ? 3 : 4) * sizeof(float));
+                memcpy(col, ref_col, components * sizeof(float));
                 value_changed = true;
             }
         }
@@ -10421,7 +10425,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     EndGroup();
     PopID();
 
-    return value_changed;
+    return value_changed && memcmp(backup_initial_col, col, components * sizeof(float));
 }
 
 // Horizontal separating line.