added debug signal caller, updated some prints to logger, added settings option for min win size

src/app.py

@@ -1,4 +1,5 @@
 # Python imports
+import signal
 import os
 
 # Lib imports
@@ -8,16 +9,40 @@ from utils.ipc_server import IPCServer
 from core.window import Window
 
 
+
+# Break into a Python console upon SIGUSR1 (Linux) or SIGBREAK (Windows:
+# CTRL+Pause/Break).  To be included in all production code, just in case.
+def debug_signal_handler(signal, frame):
+    del signal
+    del frame
+
+    try:
+        import rpdb2
+        logger.debug("\n\nStarting embedded RPDB2 debugger. Password is 'foobar'\n\n")
+        rpdb2.start_embedded_debugger("foobar", True, True)
+        rpdb2.setbreak(depth=1)
+        return
+    except StandardError:
+        pass
+
+    try:
+        import code
+        code.interact()
+    except StandardError as ex:
+        logger.debug(f"{ex}, returning to normal program flow...")
+
+
+
 class AppLaunchException(Exception):
     ...
 
 
-
 class Application(IPCServer):
     """ docstring for Application. """
 
     def __init__(self, args, unknownargs):
         super(Application, self).__init__()
+
         if not settings.is_trace_debug():
             try:
                 self.create_ipc_listener()
@@ -32,4 +57,13 @@ class Application(IPCServer):
 
                 raise AppLaunchException(f"{app_name} IPC Server Exists: Will send path(s) to it and close...")
 
+        try:
+            signal.signal(
+                    vars(signal).get("SIGBREAK") or vars(signal).get("SIGUSR1"),
+                    debug_signal_handler
+                    )
+        except ValueError:
+            # Typically: ValueError: signal only works in main thread
+            ...
+
         Window(args, unknownargs)