Add error status SC_STATUS_OUTSIDE_DOCUMENT that is set when operations are

attempted on a position outside the document.
Positions are checked earlier to prevent actions partly succeeding.
This is implemented with a new exception type Failure which should be caught by
platform layer's API handling code to produce a more granular error status.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/CellBuffer.h b/src/CellBuffer.h
index d54d2be8d..11479f14a 100644
--- a/src/CellBuffer.h
+++ b/src/CellBuffer.h
@@ -10,6 +10,11 @@
 
 namespace Scintilla::Internal {
 
+struct Failure : public std::runtime_error {
+	Status status;
+	Failure(Status status_) : std::runtime_error("failure with status"), status(status_) {}
+};
+
 // Interface to per-line data that wants to see each line insertion and deletion
 class PerLine {
 public: