From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 17 Sep 2019 12:36:33 +0000 (+0300)
Subject: Fix an unsigned overflow error in Text
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=8bc33895d1bb04adcefee405746ef3c21d99a66d

Fix an unsigned overflow error in Text
---

diff --git a/source/text.cpp b/source/text.cpp
index 1d824e0..45b6567 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -123,8 +123,9 @@ unsigned Text::get_visible_lines(const Part &part, const Geometry &parent, unsig
 	unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
 
 	const Sides &margin = part.get_margin();
-	unsigned vmargin = margin.top+margin.bottom+line_height-line_spacing;
-	unsigned n_lines = min<unsigned>(lines.size(), max((max(parent.h, vmargin)-vmargin)/line_spacing, 1U));
+	unsigned vmargin = margin.top+margin.bottom;
+	unsigned free_height = max(parent.h, vmargin)-vmargin+line_spacing-line_height;
+	unsigned n_lines = min<unsigned>(lines.size(), max(free_height/line_spacing, 1U));
 	if(fit_height)
 		*fit_height = line_height+(n_lines-1)*line_spacing;