Esc + Enter should sumbit the query in safe multiline mode.

pgcli/key_bindings.py

@@ -9,7 +9,7 @@ from prompt_toolkit.filters import (
     vi_mode,
 )
 
-from .pgbuffer import buffer_should_be_handled
+from .pgbuffer import buffer_should_be_handled, safe_multi_line_mode
 
 _logger = logging.getLogger(__name__)
 
@@ -114,7 +114,7 @@ def pgcli_bindings(pgcli):
         _logger.debug("Detected enter key.")
         event.current_buffer.validate_and_handle()
 
-    @kb.add("escape", "enter", filter=~vi_mode)
+    @kb.add("escape", "enter", filter=~vi_mode & ~safe_multi_line_mode(pgcli))
     def _(event):
         """Introduces a line break regardless of multi-line mode or not."""
         _logger.debug("Detected alt-enter key.")

pgcli/pgbuffer.py

@@ -22,6 +22,14 @@ mode, which by default will insert new lines on Enter.
 """
 
 
+def safe_multi_line_mode(pgcli):
+    @Condition
+    def cond():
+        _logger.debug('Multi-line mode state: "%s" / "%s"', pgcli.multi_line, pgcli.multiline_mode)
+        return pgcli.multi_line and (pgcli.multiline_mode == "safe")
+    return cond
+
+
 def buffer_should_be_handled(pgcli):
     @Condition
     def cond():