Fixing JSON Bug with duplication and autoformat

[nojomyth-dev]

Description

This PR fixes the duplication bug using JSON and autocomplete.

Fixes #180

Type of change

Please delete options that are not relevant.

• [x] Bug Fix (non-breaking change to fix a bug)

How to test

Please describe steps to test your change.

• [x] Connect to a MQTT server
• [x] Enter any valid JSON
• [x] Should result in correct formatting and highlighting

Requirments:

• Plugins: JSON Plugin
• Specific broker: No

Checklist:

• [x] Code follows the coding guidelines
• [ ] Code is understandable by others
• [x] Code is commented
• [x] Migration of local user data is included (if relevant)
• [x] No unexpected warnings or exceptions are thrown.
• [x] Plugin compatibility is checked (if relevant)
• [ ] Unit Tests are added

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[nojomyth-dev]

Can't find the coding guidelines, wrote it in the style of the existing code

May need another test to check, if this works with linux / macOS, since the code replaces all newlines with \n. It is possible to adapt the code to handle all platforms, if necessary. I cannot test such a feature since i don't have a linux with a GUI.