When repeating interval, rerender only if there are changes

[liron-navon]

Is your feature request related to a problem? Please describe.
I'm using insomnia to test a server that generates files, I would like to use the repeated interval to send requests to the local development server every second or so, but render the file only if it has changed since the last request, i.e not have useless renders since it makes it hard to test.

Another solution for my issue would be to solve issue 1801: #1801

Describe the solution you'd like
Check the new and last response, and only render the preview if there was a change, we could base64 the response so the comparison is the same if it's a file or a string

Describe alternatives you've considered
just call the request manually every time, but since I edit the file every few seconds, it's tiering

Additional context
I'd be more than happy to help out and implement this and also issue 1801 if the team does want to solve these issues.

Insomnia core

Version: Insomnia Core 2020.5.0
Release date: 01/12/2020
OS: Darwin x64 19.6.0
Electron: 9.1.1
Node: 12.14.1
V8: 8.3.110.13-electron.0
Architecture: x64
node-libcurl: libcurl/7.69.1 OpenSSL/1.1.1g zlib/1.2.11 brotli/1.0.7 libidn2/2.1.1 libssh2/1.9.0 nghttp2/1.41.0

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