changing char_width_pixels to be using fixedFont()

Signed-off-by: silvialpz <74107990+silvialpz@users.noreply.github.com>

Author: silvialpz

src/osltoy/codeeditor.cpp

@@ -53,8 +53,6 @@ CodeEditor::CodeEditor(QWidget* parent, const std::string& filename)
     setLineWrapMode(QPlainTextEdit::NoWrap);
     document()->setDefaultFont(fixedFont());
 
-    setTabStopDistance(4 * char_width_pixels());
-
     lineNumberArea = new LineNumberArea(this);
 
     connect(this, SIGNAL(blockCountChanged(int)), this,
@@ -66,6 +64,7 @@ CodeEditor::CodeEditor(QWidget* parent, const std::string& filename)
 
     updateLineNumberAreaWidth(0);
     highlightCurrentLine();
+    setTabStopDistance(4 * char_width_pixels());
 }
 
 
@@ -100,11 +99,12 @@ CodeEditor::text_string() const
 int
 CodeEditor::char_width_pixels() const
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
-    return fontMetrics().horizontalAdvance(QLatin1Char('M'));
+    QFontMetrics metrics(fixedFont());
+#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0) 
+    return metrics.horizontalAdvance(QLatin1Char('M'));
 #else
     // QFontMetric.width() deprecated from 5.11, marked as such in 5.13
-    return fontMetrics().width(QLatin1Char('M'));
+    return metrics.width(QLatin1Char('M'));
 #endif
 }