Take leading space width into account for painting and selection

When painting horizontally centered RTL text and selection with
trailing spaces, we need to take that space width into account
because line.textAdvance doesn't include it.

Task-number: QTBUG-18612
Reviewed-by: Eskil
(cherry picked from commit 224226727f07e8940e0d3131fe7587b11cc4a6ca)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index dab4bb75ec..ce012a818f 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -2777,12 +2777,14 @@ QFixed QTextEngine::alignLine(const QScriptLine &line)
     // if width is QFIXED_MAX that means we used setNumColumns() and that implicitly makes this line left aligned.
     if (!line.justified && line.width != QFIXED_MAX) {
         int align = option.alignment();
+        if (align & Qt::AlignLeft)
+            x -= leadingSpaceWidth(line);
         if (align & Qt::AlignJustify && isRightToLeft())
             align = Qt::AlignRight;
         if (align & Qt::AlignRight)
             x = line.width - (line.textAdvance + leadingSpaceWidth(line));
         else if (align & Qt::AlignHCenter)
-            x = (line.width - line.textAdvance)/2;
+            x = (line.width - (line.textAdvance + leadingSpaceWidth(line)))/2;
     }
     return x;
 }