Syntax: Add exit condition when determining test extends

Fixes #248.

Author: FichteFoll

plugins_/syntaxtest_dev.py

@@ -381,15 +381,19 @@ def determine_test_extends(self, lines, line, start_col):
             view.scope_name(pos)
             for pos in range(line.begin() + col_start, line.begin() + col_end)
         }
-        base_scope = path.commonprefix(list(scopes))
+        base_scope = path.commonprefix(list(scopes)).strip()
+        l.debug("Original base scope: %r", base_scope)
 
         length = 0
         for pos in range(line.begin() + col_end - 1, line.end() + 1):
             scope = view.scope_name(pos)
             if scope.startswith(base_scope):
                 scopes.add(scope)
                 length += 1
+            else:
+                break
 
+        l.debug("Total scopes covered: %r", scopes)
         return length, scopes