I opened an issue

18901 Highlight message send selector on mouse over

with an experimental implementation.

Just load the slice, enable the setting:
RubAbstractTextArea highlightMessageSend: true.

Now open a code editor (nautilus/MessageBrowser) and

move the mouse over a message send.

Or evaluate this code, it opens a text editor on�� a method, where it is difficult

to see which part of the code belongs to which method:

evaluate:
TextModel new beForCode; aboutToStyle:true;behavior: MorphTreeMorph;text:(MorphTreeMorph>>#drawLinesOn:) sourceCode;openWithSpec.

feedback welcome.

nicolai