[LyX/master] Amend 891ba726

[Enrico Forestieri]

commit d213df2f2edc081ba6e672502e008084487f736d
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Sun Jan 29 18:30:50 2023 +0100

    Amend 891ba726
    
    Avoid an assertion when the cursor is at the start of a math hull.
---
 src/DocIterator.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/DocIterator.cpp b/src/DocIterator.cpp
index 94b7792..31a5bff 100644
--- a/src/DocIterator.cpp
+++ b/src/DocIterator.cpp
@@ -549,7 +549,7 @@ void DocIterator::updateInsets(Inset * inset)
 	size_t const n = slices_.size();
 	slices_.resize(0);
 	for (size_t i = 0 ; i < n; ++i) {
-		if (dit[i].empty() && prevMath().lyxCode() == MATH_SCRIPT_CODE)
+		if (dit[i].empty() && pos() > 0 && prevMath().lyxCode() == MATH_SCRIPT_CODE)
 			// Workaround: With empty optional argument and a trailing script,
 			// we have empty slices in math macro args (#11676)
 			// FIXME: Find real cause!