[Bug] Stylesheet targeting same domains wipes existing one

[ejisoo]

Describe the bug

An active style sheet targeting existing domains will overwrite the existing style sheet.

Browser

Tested on

• Firefox 104.0.2 (64-bit)
• Chrome 105.0.5195.125 (Official Build) (arm64)

I've been using the extension and had the same issue for at least 3-4 major versions for both browsers.

To Reproduce

Steps to reproduce the behavior

• Go to Add a new style...
• Target yahoo.com and add some style

:root {
  --black: #000;
}

• Save and create another style targeting yahoo.com and keep it empty.

  /*  */

The previous style is now gone!

Expected behavior

Some options:

1. Warning that saving the style will overwrite the existing one.
2. Merge
3. Better: Merge but warn conflicting styles
4. Best: Make the user able to name the style and if no name is provided, enumerate so in the style list you see something like

   yahoo.com
   yahoo.com (1)

Additional context

I try to be careful not to lose any work. Sync doesn't help in this case because I can accidentally sync the overwritten style. This has cost me a great number of custom styles...

[milahu]

just lost a half hour of work this is ridiculous, dataloss is a serious bug

possible solution: use crdt to sync between multiple stylebot css editors

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