Ian Mackinnon

Adding the option to escape the dollar symbol with a backslash would match the behaviour of Bash (and the Node module [`dotenv-expand`](https://github.com/motdotla/dotenv-expand)). For example, in Bash: ```bash KEY=value K1=\$KEY K2=\${KEY}...

Thanks for the quick and clear response. I am totally new to this project, but in case it's useful I offer the following UI suggestions from a point of superficial...

Just a possible lead for anyone investigating this bug - it may be related to the use of `wxTAB_TRAVERSAL` in various classes throughout the Slic3r GUI source (note that as...