Set GDAL_NUM_THREADS to 1 for x86 and x64.

Force the Form's own native window handle to exist even though it is not shown.

Author: sweco-sedahd

MapWinGisTests-net/MapWinGisTests/LoaderWarmup.cs

@@ -58,13 +58,10 @@ private static void TryDelete(string path)
 	private static void ConfigureGdal()
 	{
 		try {
-			if(!Environment.Is64BitProcess)
-			{
-				// Forces GDAL to run raster operations single-threaded by setting the <c>GDAL_NUM_THREADS</c>
-				// /// environment variable before any native GDAL/OCX module is loaded.
-				if(string.IsNullOrEmpty(Environment.GetEnvironmentVariable("GDAL_NUM_THREADS")))
-					Environment.SetEnvironmentVariable("GDAL_NUM_THREADS", "1");
-			}
+			// Forces GDAL to run raster operations single-threaded by setting the <c>GDAL_NUM_THREADS</c>
+			// /// environment variable before any native GDAL/OCX module is loaded.
+			if(string.IsNullOrEmpty(Environment.GetEnvironmentVariable("GDAL_NUM_THREADS")))
+				Environment.SetEnvironmentVariable("GDAL_NUM_THREADS", "1");
 		} catch {
 			// Ignore
 		}

MapWinGisTests-net/WinFormsApp1/Form1.cs

@@ -84,6 +84,18 @@ protected override void WndProc(ref Message m)
 	public void EnsureMapControlCreated()
 	{
 		CreateControl();
+
+		// Force the FORM's own native window handle to exist even though it is never
+		// shown. Control.CreateControl() is a no-op while the control is invisible, so
+		// in headless mode the form otherwise has no handle. That makes the teardown in
+		// WinFormsTestRunner.DisposeFormWhilePumping fall back to a synchronous
+		// form.Dispose(), which destroys the child window (and performs the blocking
+		// cross-apartment UIA disconnect in Control.ReleaseUiaProvider) outside any
+		// active message pump - the deadlock observed as a hang on the 32-bit (x86)
+		// test host. Creating the handle here guarantees the pumped BeginInvoke +
+		// Application.Run teardown path is used instead, which services that call.
+		_ = Handle;
+
 		axMap1.CreateControl();
 
 		if(!axMap1.IsHandleCreated)