check_spelling: allow joining hyphenated words

Accept the spelling for hyphenated words
when the spelling of each individual word is correct.

This suppresses many terms that are better treated as false positives
such as user-defined, multi-input and edit-data.

check_source/check_spelling.py

@@ -406,8 +406,17 @@ def spell_check_file(
             if w_lower in dict_custom or w_lower in dict_ignore:
                 continue
 
-            if not dict_spelling.check(w):
-
+            is_good_spelling = dict_spelling.check(w)
+            if not is_good_spelling:
+                if "-" in w:
+                    is_good_spelling = True
+                    for w_sub in w.split("-"):
+                        if w_sub:
+                            if not dict_spelling.check(w_sub):
+                                is_good_spelling = False
+                                break
+
+            if not is_good_spelling:
                 # Ignore literals that show up in code,
                 # gets rid of a lot of noise from comments that reference variables.
                 if w in code_words: