[LyX/master] Fix minor bug mentioned in #10827

[Richard Kimberly Heck]

commit 30189332c84ab91de2c5b4570b91dae02d00b599
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Wed Jan 4 23:23:30 2023 -0500

    Fix minor bug mentioned in #10827
---
 src/frontends/qt/GuiDocument.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/frontends/qt/GuiDocument.cpp b/src/frontends/qt/GuiDocument.cpp
index 47889ca..76b0813 100644
--- a/src/frontends/qt/GuiDocument.cpp
+++ b/src/frontends/qt/GuiDocument.cpp
@@ -1888,6 +1888,7 @@ void GuiDocument::slotApply()
 	if (wasclean && only_shellescape_changed)
 		buffer().markClean();
 	modulesChanged_ = false;
+	isValid();
 }