feat(completion): complete both bounds of a date range

Each side of '..' is an independent value against the same model. Entries
that are themselves ranges are withheld once a range exists, since
date:1week....today is malformed.

The token is read to its full extent rather than truncated at the caret:
the separator deciding which bound is being edited can sit to the right
of the caret. Stems stay caret-bounded so matching never uses untyped
text.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/querycompleter.h b/src/querycompleter.h
index d9635c0..e2a983b 100644
--- a/src/querycompleter.h
+++ b/src/querycompleter.h
@@ -44,6 +44,13 @@ struct CompletionContext
     /// being completed, so accepting never disturbs neighbouring text.
     int replaceFrom = 0;
     int replaceLength = 0;
+
+    /// Whether candidates that are themselves ranges may be offered.
+    ///
+    /// The relative date entries ("1week..") are complete open-ended ranges.
+    /// Offering one inside an existing range yields date:1week....today, which
+    /// is malformed, so they are withheld once a range is underway.
+    bool allowRangeEntries = true;
 };
 
 /// Decides what the cursor position implies about completion.