[LyX/master] GuiSearch: prevent Tab key to switch to work area (part of #12170)

[Juergen Spitzmueller]

commit 9586c51c3fe2bfa2f5cb045266b9d23d42b9c7b5
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Thu May 6 12:27:38 2021 +0200

    GuiSearch: prevent Tab key to switch to work area (part of #12170)
    
    QWidget::focusNextPrevChild() passes over to the parent (which is the
    work area here) if the current window is not a dialog (isWindow()) or
    a sub-window (window flag Qt::SubWindow).
    
    We set the latter here to prevent this unwanted behavior.
    
    Let's see if there are side-effects.
---
 src/frontends/qt/GuiSearch.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/frontends/qt/GuiSearch.cpp b/src/frontends/qt/GuiSearch.cpp
index 32a8fd1..9212ddd 100644
--- a/src/frontends/qt/GuiSearch.cpp
+++ b/src/frontends/qt/GuiSearch.cpp
@@ -126,6 +126,10 @@ GuiSearchWidget::GuiSearchWidget(QWidget * parent)
 	replacePB->setEnabled(false);
 	replacePrevPB->setEnabled(false);
 	replaceallPB->setEnabled(false);
+
+	// Make this a sub window to prevent focusNextPrevChild (Tab)
+	// switching to the parent (#12170)
+	setWindowFlags(Qt::SubWindow);
 }