Always prefer breaking at word boundaries

An overlong word containing a hyphen could be broken anywhere, instead of after
the hyphen.

Example: compare the line breaking of

   aaaaa-aaaaa-aaaaa-aaaaa

with

   aaa aaaaa-aaaaa-aaaaa-aaaaa

(with a very narrow window)

This also improves Chinese text in some situations (#10299)

diff --git a/src/frontends/qt4/GuiFontMetrics.cpp b/src/frontends/qt4/GuiFontMetrics.cpp
index 50b05ace9a62d440e16d5a013c50353d4006197c..77cda8043409223c62a0b4dc39a24d57ec1025d6 100644 (file)
--- a/src/frontends/qt4/GuiFontMetrics.cpp
+++ b/src/frontends/qt4/GuiFontMetrics.cpp
@@ -303,7 +303,8 @@ bool GuiFontMetrics::breakAt(docstring & s, int & x, bool const rtl, bool const
        tl.setText(qs);
        tl.setFont(font_);
        QTextOption to;
-       to.setWrapMode(force ? QTextOption::WrapAnywhere : QTextOption::WordWrap);
+       to.setWrapMode(force ? QTextOption::WrapAtWordBoundaryOrAnywhere
+                            : QTextOption::WordWrap);
        tl.setTextOption(to);
        tl.beginLayout();
        QTextLine line = tl.createLine();