Allow menu windows from ignoring the style.WindowMinSize values so short menus are not padded. (#1909)

CHANGELOG.txt

@@ -34,8 +34,10 @@ HOW TO UPDATE?
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 Other Changes:
+
  - ArrowButton: Fixed to honor PushButtonRepeat() setting (and internals' ImGuiItemFlags_ButtonRepeat).
  - ArrowButton: Setup current line text baseline so that ArrowButton() + SameLine() + Text() are aligned properly.
+ - Window: Allow menu windows from ignoring the style.WindowMinSize values so short menus are not padded. (#1909)
 
 
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imgui.cpp

@@ -5775,7 +5775,10 @@ static ImVec2 CalcSizeAutoFit(ImGuiWindow* window, const ImVec2& size_contents)
     else
     {
         // When the window cannot fit all contents (either because of constraints, either because screen is too small): we are growing the size on the other axis to compensate for expected scrollbar. FIXME: Might turn bigger than DisplaySize-WindowPadding.
-        ImVec2 size_auto_fit = ImClamp(size_contents, style.WindowMinSize, ImMax(style.WindowMinSize, g.IO.DisplaySize - g.Style.DisplaySafeAreaPadding * 2.0f));
+        ImVec2 size_min(0.0f, 0.0f);
+        if (!(window->Flags & ImGuiWindowFlags_ChildMenu))
+            size_min = style.WindowMinSize;
+        ImVec2 size_auto_fit = ImClamp(size_contents, size_min, ImMax(size_min, g.IO.DisplaySize - style.DisplaySafeAreaPadding * 2.0f));
         ImVec2 size_auto_fit_after_constraint = CalcSizeAfterConstraint(window, size_auto_fit);
         if (size_auto_fit_after_constraint.x < size_contents.x && !(window->Flags & ImGuiWindowFlags_NoScrollbar) && (window->Flags & ImGuiWindowFlags_HorizontalScrollbar))
             size_auto_fit.y += style.ScrollbarSize;
@@ -13877,9 +13880,10 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                 ImGuiWindowFlags flags = window->Flags;
                 NodeDrawList(window, window->DrawList, "DrawList");
                 ImGui::BulletText("Pos: (%.1f,%.1f), Size: (%.1f,%.1f), SizeContents (%.1f,%.1f)", window->Pos.x, window->Pos.y, window->Size.x, window->Size.y, window->SizeContents.x, window->SizeContents.y);
-                ImGui::BulletText("Flags: 0x%08X (%s%s%s%s%s%s..)", flags,
+                ImGui::BulletText("Flags: 0x%08X (%s%s%s%s%s%s%s..)", flags,
                     (flags & ImGuiWindowFlags_ChildWindow) ? "Child " : "", (flags & ImGuiWindowFlags_Tooltip)   ? "Tooltip "   : "", (flags & ImGuiWindowFlags_Popup) ? "Popup " : "",
-                    (flags & ImGuiWindowFlags_Modal)       ? "Modal " : "", (flags & ImGuiWindowFlags_ChildMenu) ? "ChildMenu " : "", (flags & ImGuiWindowFlags_NoSavedSettings) ? "NoSavedSettings " : "");
+                    (flags & ImGuiWindowFlags_Modal)       ? "Modal " : "", (flags & ImGuiWindowFlags_ChildMenu) ? "ChildMenu " : "", (flags & ImGuiWindowFlags_NoSavedSettings) ? "NoSavedSettings " : "",
+                    (flags & ImGuiWindowFlags_AlwaysAutoResize) ? "AlwaysAutoResize" : "");
                 ImGui::BulletText("Scroll: (%.2f/%.2f,%.2f/%.2f)", window->Scroll.x, GetScrollMaxX(window), window->Scroll.y, GetScrollMaxY(window));
                 ImGui::BulletText("Active: %d, WriteAccessed: %d", window->Active, window->WriteAccessed);
                 ImGui::BulletText("NavLastIds: 0x%08X,0x%08X, NavLayerActiveMask: %X", window->NavLastIds[0], window->NavLastIds[1], window->DC.NavLayerActiveMask);