Menus: added internal's BeginMenuEx() matching MenuItemEx() with icon parameter. (amend f8fae022)

imgui_internal.h

@@ -2442,6 +2442,7 @@ namespace ImGui
     IMGUI_API bool          BeginViewportSideBar(const char* name, ImGuiViewport* viewport, ImGuiDir dir, float size, ImGuiWindowFlags window_flags);
 
     // Menus
+    IMGUI_API bool          BeginMenuEx(const char* label, const char* icon, bool enabled = true);
     IMGUI_API bool          MenuItemEx(const char* label, const char* icon, const char* shortcut = NULL, bool selected = false, bool enabled = true);
 
     // Combos

imgui_widgets.cpp

@@ -6789,7 +6789,7 @@ void ImGui::EndMainMenuBar()
     End();
 }
 
-bool ImGui::BeginMenu(const char* label, bool enabled)
+bool ImGui::BeginMenuEx(const char* label, const char* icon, bool enabled)
 {
     ImGuiWindow* window = GetCurrentWindow();
     if (window->SkipItems)
@@ -6856,13 +6856,15 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
         // (In a typical menu window where all items are BeginMenu() or MenuItem() calls, extra_w will always be 0.0f.
         //  Only when they are other items sticking out we're going to add spacing, yet only register minimum width into the layout system.
         popup_pos = ImVec2(pos.x, pos.y - style.WindowPadding.y);
-        float icon_w = 0.0f; // FIXME: This not currently exposed for BeginMenu() however you can call window->DC.MenuColumns.DeclColumns(w, 0, 0, 0) yourself
+        float icon_w = (icon && icon[0]) ? CalcTextSize(icon, NULL).x : 0.0f;
         float checkmark_w = IM_FLOOR(g.FontSize * 1.20f);
         float min_w = window->DC.MenuColumns.DeclColumns(icon_w, label_size.x, 0.0f, checkmark_w); // Feedback to next frame
         float extra_w = ImMax(0.0f, GetContentRegionAvail().x - min_w);
         ImVec2 text_pos(window->DC.CursorPos.x + offsets->OffsetLabel, window->DC.CursorPos.y + window->DC.CurrLineTextBaseOffset);
         pressed = Selectable("", menu_is_open, ImGuiSelectableFlags_NoHoldingActiveID | ImGuiSelectableFlags_SelectOnClick | ImGuiSelectableFlags_DontClosePopups | ImGuiSelectableFlags_SpanAvailWidth, ImVec2(min_w, 0.0f));
         RenderText(text_pos, label);
+        if (icon_w > 0.0f)
+            RenderText(pos + ImVec2(offsets->OffsetIcon, 0.0f), icon);
         RenderArrow(window->DrawList, pos + ImVec2(offsets->OffsetMark + extra_w + g.FontSize * 0.30f, 0.0f), GetColorU32(ImGuiCol_Text), ImGuiDir_Right);
     }
     if (!enabled)
@@ -6967,6 +6969,11 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
     return menu_is_open;
 }
 
+bool ImGui::BeginMenu(const char* label, bool enabled)
+{
+    return BeginMenuEx(label, NULL, enabled);
+}
+
 void ImGui::EndMenu()
 {
     // Nav: When a left move request _within our child menu_ failed, close ourselves (the _parent_ menu).