[LyX/2.3.x] Correctly compute metrics for single-char non-math fonts

[Enrico Forestieri]

commit a85bd343480007cf9d8023bd68a79e97a9233d58
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Thu Aug 6 19:10:23 2020 +0200

    Correctly compute metrics for single-char non-math fonts
    
    No status entry needed, as this amends 79998fdc.
---
 src/frontends/qt4/GuiFontMetrics.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt4/GuiFontMetrics.cpp b/src/frontends/qt4/GuiFontMetrics.cpp
index 02c5054..9ad6c17 100644
--- a/src/frontends/qt4/GuiFontMetrics.cpp
+++ b/src/frontends/qt4/GuiFontMetrics.cpp
@@ -218,7 +218,7 @@ int GuiFontMetrics::width(docstring const & s) const
 	int w = 0;
 	if (s.length() == 1
 #if QT_VERSION >= 0x040800
-	    || font_.styleName() == "LyX"
+	    && font_.styleName() == "LyX"
 #endif
 	    ) {
 		// keep value 0 for math chars with null width