[Interest] Text editor's line numbers: misalignment

Sensei senseiwa at gmail.com
Wed Aug 22 09:55:37 CEST 2012

Hi all, I've got a question about QPlainTextEdit, adding line numbers.

I've been following the Qt example in 
http://qt-project.org/doc/qt-4.8/widgets-codeeditor.html, but I am 
experiencing a *very weird* problem. The only difference with the code 
above is in the constructor, as you can see in the code below.

If I change the font to "Courier", or "Times", or "Andale Mono" or 
Xcode's "Menlo", everything is OK, I've tested alignment with 10K lines.

When I use "Monaco", the font I intended to use, lines numbers get 
misaligned almost immediately.

Can someone confim this? I didn't test this with many other fonts, but I 
can tell you this: even Zapfino gets aligned correctly.

Thanks & Cheers!

CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
   lineNumberArea = new LineNumberArea(this);

   connect(this, SIGNAL(blockCountChanged(int)), this, 
   connect(this, SIGNAL(updateRequest(QRect,int)), this, 
   connect(this, SIGNAL(cursorPositionChanged()), this, 

   setFont(QFont("Courier", 22));


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