Adds more idetools suggest failure cases.

tests/caas/suggest-invalid-source.txt

@@ -0,0 +1,26 @@
+main_dirty.nim
+# A variant of the suggest-compile.txt, instead of using a "base" correct
+# source, this one uses the "broken" main_dirty.nim which won't compile. The
+# test tries to stress idetools to still provide a valid answer if possible,
+# and at least provide the same output with repeated queries rather than dying
+# after the first compilation error.
+
+# The first query should work and provide valid suggestions.
+> idetools --track:$TESTNIM,12,6 --suggest $SILENT
+skField\tx
+skField\ty
+
+# Repeating the query should work too.
+> idetools --track:$TESTNIM,12,6 --suggest $SILENT
+skField\tx
+skField\ty
+
+# Expect now a compilation failure.
+> c
+!SuccessX
+invalid indentation
+
+# Repeating suggestions *after broken compilation* should work too.
+> idetools --track:$TESTNIM,12,6 --suggest $SILENT
+skField\tx
+skField\ty