[LyX/master] Use correct width for \fint

[Enrico Forestieri]

On Tue, Sep 08, 2020 at 01:41:57PM -0400, Scott Kostyshak wrote:
> 
> This commit changes some spacing of an integral limit. See the attached
> .lyx file and screenshots for before/after. In particular, the spacing
> around '\in', ':', and '\le' is reduced.

Please, try the attached patch.

-- 
Enrico
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diff --git a/src/frontends/qt/GuiFontMetrics.cpp b/src/frontends/qt/GuiFontMetrics.cpp
index 361125056e..0f4c14adc5 100644
--- a/src/frontends/qt/GuiFontMetrics.cpp
+++ b/src/frontends/qt/GuiFontMetrics.cpp
@@ -246,9 +246,12 @@ int GuiFontMetrics::width(docstring const & s) const
 	bool const math_char = s.length() == 1;
 #endif
 	if (math_char) {
+		QString const qs = toqstr(s);
+		int br_width = metrics_.boundingRect(qs).width();
+		int s_width = metrics_.width(qs);
 		// keep value 0 for math chars with width 0
-		if (metrics_.width(toqstr(s)) != 0)
-			w = metrics_.boundingRect(toqstr(s)).width();
+		if (s_width != 0)
+			w = max(br_width, s_width);
 	} else {
 		QTextLayout tl;
 		tl.setText(toqstr(s));