Fix for bug #3043419 Unfolding incorrectly.

When new line characters are inserted on a folded fold header line,
the fold is unfolded.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/Editor.cxx b/src/Editor.cxx
index 50d666a60..504cf5446 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -4364,7 +4364,16 @@ void Editor::NotifyModified(Document *, DocModification mh, void *) {
 			// Some lines are hidden so may need shown.
 			// TODO: check if the modified area is hidden.
 			if (mh.modificationType & SC_MOD_BEFOREINSERT) {
-				NotifyNeedShown(mh.position, 0);
+				int lineOfPos = pdoc->LineFromPosition(mh.position);
+				bool insertingNewLine = false;
+				for (int i=0; i < mh.length; i++) {
+					if ((mh.text[i] == '\n') || (mh.text[i] == '\r'))
+						insertingNewLine = true;
+				}
+				if (insertingNewLine && (mh.position != pdoc->LineStart(lineOfPos)))
+					NotifyNeedShown(mh.position, pdoc->LineStart(lineOfPos+1) - mh.position);
+				else
+					NotifyNeedShown(mh.position, 0);
 			} else if (mh.modificationType & SC_MOD_BEFOREDELETE) {
 				NotifyNeedShown(mh.position, mh.length);
 			}