priority test, docs & fmt fixes

doc/UltiSnips.txt

@@ -1333,10 +1333,8 @@ endsnippet
 That snippet will expand to 'return err' only if the previous line is starting
 from 'if err' prefix.
 
-Note: context snippets prioritized over non-context ones. So, if there are
-two snippets with the same trigger, and one of them is context snippet and
-it's expression evaluates to 'True', then context snippet will be used for
-expansion and first will be ignored.
+Note: context snippets prioritized over non-context ones. It makes possible to
+use non-context snippets as fallback, if no context matched:
 
 ------------------- SNIP -------------------
 snippet i "if ..." b

test/test_ContextSnippets.py

@@ -85,3 +85,19 @@ class ContextSnippets_SnippetPriority(_VimTest):
         if true {
             // pass
         }"""
+
+
+class ContextSnippets_PriorityKeyword(_VimTest):
+    files = { 'us/all.snippets': r"""
+        snippet i "desc" "True" e
+        a
+        endsnippet
+
+        priority 100
+        snippet i
+        b
+        endsnippet
+        """}
+
+    keys = "i" + EX
+    wanted = "b"

test/test_UltiSnipFunc.py

@@ -159,7 +159,8 @@ class MySnippetSource(SnippetSource):
     if before.endswith('blumba'):
       return [
           UltiSnipsSnippetDefinition(
-              -100, "blumba", "this is a dynamic snippet", "", "", {}, "blub", None)
+              -100, "blumba", "this is a dynamic snippet", "", "", {}, "blub",
+              None)
         ]
     return []
 """)