In the previous thread I discussed four new files in Leo's leo/config 
directory: leo10pt.leo, leo12pt.leo, leo14-12pt.leo and leo14pt.leo.

These files are an example of an important technique, that belongs in a Leo 
tips section.

The idea is to use .leo files to test settings rather than to contain data.

This is a surprisingly important technique, one that first occurred to me 
last week. Indeed, it was an essential step in getting the vim-mode project 
started.  I created a file, called ekr-vim.leo, and a corresponding script 
that launched it.  This file contains @bool vim-mode = True. As a result, I 
can test vim mode *safely*, without interfering with my normal work flow.

In other words, these kinds of files limit the effects of 
experimental/non-standard/risky settings to a single file.  It's a great 
technique to know.

As the latest example, the files leo10pt.leo, leo12pt.leo, leo14-12pt.leo 
and leo14pt.leo make it easy to compare different font settings.

Edward

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