[ox/std] Fix string append issues

deps/ox/src/ox/std/string.hpp

@@ -392,7 +392,7 @@ template<std::size_t SmallStringSize_v>
 constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operator+(const char *str) const noexcept {
 	const std::size_t strLen = ox::strlen(str);
 	const auto currentLen = len();
-	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
+	BasicString<SmallStringSize_v> cpy;
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
 	ox::listcpy(&cpy.m_buff[currentLen], str, strLen);
@@ -425,7 +425,8 @@ constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operato
 	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
-	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen + 1);
+	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen);
+	cpy.m_buff[cpy.m_buff.size() - 1] = 0;
 	return cpy;
 }
 
@@ -436,7 +437,8 @@ constexpr BasicString<SmallStringSize_v> BasicString<SmallStringSize_v>::operato
 	BasicString<SmallStringSize_v> cpy(currentLen + strLen);
 	cpy.m_buff.resize(m_buff.size() + strLen);
 	ox::listcpy(&cpy.m_buff[0], m_buff.data(), currentLen);
-	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen + 1);
+	ox::listcpy(&cpy.m_buff[currentLen], src.data(), strLen);
+	cpy.m_buff[cpy.m_buff.size() - 1] = 0;
 	return cpy;
 }
 

src/nostalgia/modules/core/src/studio/paletteeditor/CMakeLists.txt

@@ -1,6 +1,7 @@
 target_sources(
 	NostalgiaCore-Studio PRIVATE
 		commands/addcolorcommand.cpp
+		commands/addpagecommand.cpp
 		commands/applycolorallpagescommand.cpp
 		commands/duplicatepagecommand.cpp
 		commands/movecolorcommand.cpp

src/nostalgia/modules/core/src/studio/paletteeditor/commands/addpagecommand.cpp

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016 - 2025 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include "commands.hpp"
+
+#include "addpagecommand.hpp"
+
+namespace nostalgia::core {
+
+AddPageCommand::AddPageCommand(Palette &pal) noexcept:
+		m_pal(pal) {}
+
+int AddPageCommand::commandId() const noexcept {
+	return static_cast<int>(PaletteEditorCommandId::AddPage);
+}
+
+ox::Error AddPageCommand::redo() noexcept {
+	m_pal.pages.emplace_back(ox::sfmt("Page {}", m_pal.pages.size() + 1), ox::Vector<PaletteColor>{});
+	return {};
+}
+
+ox::Error AddPageCommand::undo() noexcept {
+	m_pal.pages.pop_back();
+	return {};
+}
+
+}

src/nostalgia/modules/core/src/studio/paletteeditor/commands/addpagecommand.hpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2016 - 2025 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#include <studio/studio.hpp>
+
+#include <nostalgia/core/palette.hpp>
+
+namespace nostalgia::core {
+
+class AddPageCommand: public studio::UndoCommand {
+	private:
+		Palette &m_pal;
+
+	public:
+		explicit AddPageCommand(Palette &pal) noexcept;
+
+		~AddPageCommand() noexcept override = default;
+
+		[[nodiscard]]
+		int commandId() const noexcept final;
+
+		ox::Error redo() noexcept final;
+
+		ox::Error undo() noexcept final;
+
+};
+
+}

src/nostalgia/modules/core/src/studio/paletteeditor/commands/commands.hpp

@@ -9,6 +9,7 @@ namespace nostalgia::core {
 enum class PaletteEditorCommandId {
 	ApplyColorAllPages,
 	RenamePage,
+	AddPage,
 	DuplicatePage,
 	RemovePage,
 	AddColor,

src/nostalgia/modules/core/src/studio/paletteeditor/commands/duplicatepagecommand.cpp

@@ -23,7 +23,7 @@ int DuplicatePageCommand::commandId() const noexcept {
 }
 
 ox::Error DuplicatePageCommand::redo() noexcept {
-	m_pal.pages.emplace(m_dstIdx, "", std::move(m_page));
+	m_pal.pages.emplace(m_dstIdx, ox::sfmt("Page {}", m_pal.pages.size() + 1), std::move(m_page));
 	return {};
 }
 

src/nostalgia/modules/core/src/studio/paletteeditor/paletteeditor-imgui.cpp

@@ -7,6 +7,7 @@
 #include <keel/media.hpp>
 
 #include "commands/addcolorcommand.hpp"
+#include "commands/addpagecommand.hpp"
 #include "commands/applycolorallpagescommand.hpp"
 #include "commands/duplicatepagecommand.hpp"
 #include "commands/movecolorcommand.hpp"
@@ -196,7 +197,11 @@ void PaletteEditorImGui::drawPagesEditor() noexcept {
 	constexpr auto toolbarHeight = 40;
 	auto const btnSz = ImVec2{paneSz.x / 4 - 5.5f, 24};
 	if (ImGui::Button("Add", btnSz)) {
+		if (m_pal.pages.empty()) {
+			std::ignore = pushCommand<AddPageCommand>(m_pal);
+		} else {
 			std::ignore = pushCommand<DuplicatePageCommand>(m_pal, 0u, m_pal.pages.size());
+		}
 		m_page = m_pal.pages.size() - 1;
 	}
 	ImGui::SameLine();

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditor-imgui.cpp

@@ -234,7 +234,7 @@ void TileSheetEditorImGui::draw(studio::StudioContext&) noexcept {
 		ImGui::BeginChild("SubSheets", {s_palViewWidth - 24, ySize / 2.f}, true);
 		{
 			static constexpr auto btnHeight = ig::BtnSz.y;
-			auto const btnSize = ImVec2{btnHeight, btnHeight};
+			auto constexpr btnSize = ImVec2{btnHeight, btnHeight};
 			if (ig::PushButton("+", btnSize)) {
 				auto insertOnIdx = m_model.activeSubSheetIdx();
 				auto const&parent = m_model.activeSubSheet();
@@ -258,7 +258,10 @@ void TileSheetEditorImGui::draw(studio::StudioContext&) noexcept {
 				m_exportMenu.show();
 			}
 			TileSheet::SubSheetIdx path;
-			static constexpr auto flags = ImGuiTableFlags_RowBg | ImGuiTableFlags_NoBordersInBody;
+			static constexpr auto flags =
+				ImGuiTableFlags_RowBg |
+                ImGuiTableFlags_NoBordersInBody |
+                ImGuiTableFlags_ScrollY;
             if (ImGui::BeginTable("Subsheets", 4, flags)) {
                 ImGui::TableSetupColumn("Subsheet", ImGuiTableColumnFlags_NoHide);
                 ImGui::TableSetupColumn("ID", ImGuiTableColumnFlags_WidthFixed, 25);
@@ -462,8 +465,12 @@ void TileSheetEditorImGui::drawPaletteMenu() noexcept {
 		}
 	}
 	// header
+	auto constexpr palTblFlags =
+		ImGuiTableFlags_RowBg |
+        ImGuiTableFlags_SizingStretchProp |
+        ImGuiTableFlags_ScrollY;
 	if (ImGui::BeginTable(
-			"PaletteTable", 4, ImGuiTableFlags_RowBg | ImGuiTableFlags_SizingStretchProp)) {
+			"PaletteTable", 4, palTblFlags)) {
 		ImGui::TableSetupColumn("Idx", 0, 0.6f);
 		ImGui::TableSetupColumn("", 0, 0.22f);
 		ImGui::TableSetupColumn("Name", 0, 3);