fix MT problem regarding Process creation

src/ahk_x11.cr

@@ -3,9 +3,15 @@ require "./build/builder"
 require "./run/runner"
 
 fun main(argc : Int32, argv : UInt8**) : Int32
+	# It's also possible to run everything *without* `preview_mt` and spawn threads manually instead.
+	# This is mostly complete in the `gui-without-preview_mt` branch but because Channels don't work
+	# in MT, this needs suboptimal workarounds. Also, in that branch, gui glabel actions aren't
+	# working because the gui code is expected to modify the threads array from the main thread...
+	# It's all possible but rather ugly, so I went with MT for now.
+	#
 	# Enforce 4 threads because less than that break the program. For now, this is the
-	# only way to enforce it. (1 = main, 2 = x11, 3 = gui, 4 = ? probably timer, 5 = actually the amount is undefined because stdlib may use `spawn`s several times. TODO:)
-	LibC.setenv("CRYSTAL_WORKERS", "8", 1)
+	# only way to enforce it. (1 = main, 2 = x11, 3 = gui, 4 = ? probably timer)
+	LibC.setenv("CRYSTAL_WORKERS", "4", 1)
 	Crystal.main(argc, argv)
 end
 

src/run/runner.cr

@@ -54,8 +54,13 @@ module Run
 		def run(*, hotkeys, hotstrings, auto_execute_section : Cmd::Base)
 			hotkeys.each { |h| add_hotkey h }
 			hotstrings.each { |h| add_hotstring h }
-			spawn @x11.run self, @settings.hotstring_end_chars # separate worker thread because event loop is blocking
-			spawn @gui.run # separate worker thread because gtk loop is blocking
+			# Cannot use normal mt `spawn` because https://github.com/crystal-lang/crystal/issues/12392
+			::Thread.new do
+				@x11.run self, @settings.hotstring_end_chars # separate worker thread because event loop is blocking
+			end
+			::Thread.new do
+				@gui.run # separate worker thread because gtk loop is blocking
+			end
 			spawn same_thread: true { clock }
 			@auto_execute_thread = add_thread auto_execute_section, 0
 		end