The thread How can I change line height / line spacing in Eclipse? deals with this problem.
The thread contains various semi-solutions, among which the best one might be to use the
font DejaVu Sans Mono.
The thread Recommended Fonts for Programming? contains more font recommendations.
In general, I don't believe you can change the line-height in Eclipse, so the most
you can do is change the font it uses.
If you cannot find a font you like, the next step is to modify an existing font
or make your own (maybe starting from a template).
The approaches you can take are :
- Use a font editor. A quick google got me FontForge (free) and FontCreator (commercial and costly, trial available). Type light is a fully functional, freeware OpenType font editor.
- Make your own font, using for example a website such as FontStruct (free),
YourFonts (seems free) or Fontifier (9$).
- Change the way Windows displays the screen (more info here)