[LyX/master] Force redraw after completion

[Jean-Marc Lasgouttes]

commit f400a2cfa9b5552c103da0b7e336b6964dfa5b2d
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Fri Jan 28 17:13:30 2022 +0100

    Force redraw after completion
    
    Inside a math inset when completing macro names, it could lead to crashes.
    
    Note that this processUpdateFlags is present when outside of this if() branch.
---
 src/frontends/qt/GuiCompleter.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/frontends/qt/GuiCompleter.cpp b/src/frontends/qt/GuiCompleter.cpp
index 6fd39d3..6effd3d 100644
--- a/src/frontends/qt/GuiCompleter.cpp
+++ b/src/frontends/qt/GuiCompleter.cpp
@@ -701,6 +701,10 @@ void GuiCompleter::tab()
 		hidePopup();
 		hideInline(cur);
 		updateVisibility(false, false);
+
+		// redraw if needed
+		if (cur.result().screenUpdate())
+			gui_->bufferView().processUpdateFlags(cur.result().screenUpdate());
 		return;
 	}
 	docstring nextchar = completion.substr(prefix.size(), 1);