Draw, MacOS - Fix image generation issue

[dpasukhi]

Suppress Metal initialization errors on macOS by pre-warming graphics context

[Copilot]

Pull Request Overview

This PR fixes image generation issues on macOS by implementing Metal initialization error suppression through graphics context pre-warming. The fix addresses crashes or errors that occur during Metal framework initialization on macOS systems.

• Added Metal initialization pre-warming logic to suppress graphics context errors
• Updated version from rc1 to rc2 to reflect the fix
• Expanded test coverage to include additional test suites

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/Draw/TKDraw/Draw/Draw_Window_1.mm	Implements Metal initialization pre-warming with error suppression
adm/cmake/version.cmake	Updates development version from rc1 to rc2
.github/actions/testgrid/testmacos.tcl	Expands test coverage to include helix and standard test suites

[Copilot]

The static boolean variable isMetalInitialized is not thread-safe. If this function can be called from multiple threads, consider using std::once_flag with std::call_once or adding proper synchronization to prevent race conditions during Metal initialization.

Suggested change

	static bool isMetalInitialized = false;
	if (!isMetalInitialized) {
	static std::once_flag metalInitFlag;
	std::call_once(metalInitFlag, []() {

[Copilot]

Catching all NSException types without specifying the exception type or logging the error could hide important debugging information. Consider logging the exception details or catching more specific exception types to aid in troubleshooting Metal initialization issues.

Suggested change

	@catch (NSException*) {
	// Ignore any Metal initialization exceptions
	@catch (NSException* exception) {
	// Log Metal initialization exceptions for debugging purposes
	NSLog(@"Metal initialization failed with exception: %@ - %@", [exception name], [exception reason]);