TextLinkOpenURL(): fixed default Win32 io.PlatformOpenInShellFn handler to handle UTF-8 regardless of system regional settings. (#7660)

docs/CHANGELOG.txt

@@ -57,6 +57,8 @@ Other changes:
   which amusingly made it disappear when using very big font/frame size.
 - Tables: fixed calling SetNextWindowScroll() on clipped scrolling table
   to not leak the value into a subsequent window. (#8196)
+- TextLinkOpenURL(): fixed default Win32 io.PlatformOpenInShellFn handler to
+  handle UTF-8 regardless of system regional settings. (#7660) [@achabense]
 - Demo: Combos: demonstrate a very simple way to add a filter to a combo,
   by showing the filter inside the combo contents. (#718)
 - Backends: Metal: Fixed a crash on application resources. (#8367, #7419) [@anszom]

imgui.cpp

@@ -15090,7 +15090,11 @@ static void Platform_SetClipboardTextFn_DefaultImpl(ImGuiContext* ctx, const cha
 #endif
 static bool Platform_OpenInShellFn_DefaultImpl(ImGuiContext*, const char* path)
 {
-    return (INT_PTR)::ShellExecuteA(NULL, "open", path, NULL, NULL, SW_SHOWDEFAULT) > 32;
+    const int path_wsize = ::MultiByteToWideChar(CP_UTF8, 0, path, -1, NULL, 0);
+    ImVector<wchar_t> path_wbuf;
+    path_wbuf.resize(path_wsize);
+    ::MultiByteToWideChar(CP_UTF8, 0, path, -1, path_wbuf.Data, path_wsize);
+    return (INT_PTR)::ShellExecuteW(NULL, L"open", path_wbuf.Data, NULL, NULL, SW_SHOWDEFAULT) > 32;
 }
 #else
 #include <sys/wait.h>

imgui.h

@@ -3565,7 +3565,7 @@ struct ImGuiPlatformIO
     void*       Platform_ClipboardUserData;
 
     // Optional: Open link/folder/file in OS Shell
-    // (default to use ShellExecuteA() on Windows, system() on Linux/Mac)
+    // (default to use ShellExecuteW() on Windows, system() on Linux/Mac)
     bool        (*Platform_OpenInShellFn)(ImGuiContext* ctx, const char* path);
     void*       Platform_OpenInShellUserData;
 

imgui_demo.cpp

@@ -7771,6 +7771,9 @@ void ImGui::ShowAboutWindow(bool* p_open)
 #ifdef IMGUI_DISABLE_WIN32_FUNCTIONS
         ImGui::Text("define: IMGUI_DISABLE_WIN32_FUNCTIONS");
 #endif
+#ifdef IMGUI_DISABLE_DEFAULT_SHELL_FUNCTIONS
+        ImGui::Text("define: IMGUI_DISABLE_DEFAULT_SHELL_FUNCTIONS");
+#endif
 #ifdef IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS
         ImGui::Text("define: IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS");
 #endif