Add -s support for wails dev

[leaanthony]

Fixes #1623

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[stffabi]

Just crossed my mind, couldn't we skip building the frontend in dev mode if we use an external dev server?

Since #1615 we install all dependencies for the frontend/devserver outside of the build. So we could always skip building the frontend in that case, since we only proxy to the external dev server.

[leaanthony]

That's a valid point. I think we should keep this flag for when someone doesn't use a Dev server but we should skip when they do 👍

[stffabi]

Yeah, absolutely.

[leaanthony]

@stffabi - looks like you added this scenario in March: https://github.com/wailsapp/wails/blob/master/v2/cmd/wails/internal/commands/dev/dev.go#L689-L691

If you're happy this covers that scenario then I think this is ready for merging 👍

[stffabi]

@stffabi - looks like you added this scenario in March: https://github.com/wailsapp/wails/blob/master/v2/cmd/wails/internal/commands/dev/dev.go#L689-L691

That will only skip triggering a reload of the frontend when frontend files get changed. It won't prevent building the frontend when a rebuild due to changed go files is triggered.

I think the following should do what we want:

- IgnoreFrontend: false,
+ IgnoreFrontend: flags.skipFrontend || flags.frontendDevServerURL != "",

[leaanthony]

Perfect! I'll get that in tonight.