[LyX/master] GuiLyXFiles: fix button controller handling

[Juergen Spitzmueller]

commit 4393382f0297ca34860b5867506c6860c4c6c1ef
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sun Sep 3 15:09:13 2023 +0200

    GuiLyXFiles: fix button controller handling
---
 src/frontends/qt/GuiLyXFiles.cpp |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt/GuiLyXFiles.cpp b/src/frontends/qt/GuiLyXFiles.cpp
index 06bc005..059080e 100644
--- a/src/frontends/qt/GuiLyXFiles.cpp
+++ b/src/frontends/qt/GuiLyXFiles.cpp
@@ -492,6 +492,9 @@ void GuiLyXFiles::updateContents()
 	filesLW->sortItems(0, Qt::AscendingOrder);
 	// redo filter
 	filterLabels();
+	if (!isClosing())
+		// handle buttons
+		bc().setValid(isValid());
 }
 
 
@@ -627,8 +630,6 @@ void GuiLyXFiles::paramsToDialog()
 		setTitle(qt_("New File From Template"));
 	else
 		setTitle(qt_("Open File"));
-
-	bc().setValid(isValid());
 }