option to display paired bases with gray rectangle

[dave-doty]

Currently "base pair lines" can be displayed, which helps when making figures:

Another common convention is to depicted double-stranded regions with a gray rectangle connecting the two DNA strands (e.g., from https://www.solo-group.link/papers/dsd-leakless.pdf, Leakless DNA strand displacement systems, Chris Thachuk, Erik Winfree, David Soloveichik, [DNA Computing and Molecular Programming 21 (DNA21), 2015]):

Give this as another view option under View-->Base pairs-->then have a radio button selector (DialogRadio) with three options:

• None
• Lines
• Rectangle

With "... even if bases mismatch" disabled if None is selected.

[rayzhuca]

Before I implement it, I wanted to double check that I have the correct idea in mind. So we just replace the baselines with a grey rectangle?

[dave-doty]

Before I implement it, I wanted to double check that I have the correct idea in mind. So we just replace the baselines with a grey rectangle?

Exactly, that looks perfect.