fix(patchers): patch router without permanent absolute _oc_webroot

[ShGKme]

☑️ Resolves

@nextcloud/router cannot be used as it is, because it relies on window.location which is different on Desktop app.

Before

• For functions returning relative link, window._oc_webroot was replaced with an absolute base path instead of relative (https://nextcloud.ltd/cloud instead of /cloud) to return an absolute link
• For functions returning an absolute link, a complete copy-pasting solution was made

It makes it impossible to work with relative links. And it is just not clean

getBaseUrl was literally the same as getRootUrl.

After

_oc_webroot is now kept original (relative) and only when needed temporally replaced with an absolute.

Added OCA.Talk.Desktop.runWithAbsoluteWebroot helper to run another function having absolute webroot.

@nextcloud/router is now patched with this helper and re-defined baseURL default value for simplicity, keeping the original implementation.

🖼️ Screenshots

Support for relative links in Talk by new autolink in NcRichText

🏚️ Before	🏡 After

Also works with absolute links, but only if there is no base (webroot).

[Antreesy]

🦭

Looks valid, but didn't test. Can give it a try, if you describe edge cases that don't work with current app-handling (without PR)

[ShGKme]

Can give it a try, if you describe edge cases that don't work with current app-handling (without PR)

Currently it can be tested with relative links like [/call/<token>](/call/<token>). See Before/after in screenshots.

But the most important part is that it makes getBaseUrl and getRootUrl works the same as on Web.
Before on Talk Desktop it was like getBaseUrl === getRootUrl, both were absolute.

New approach of patching allows to have much less custom behavior on Talk Desktop, less custom code in the patcher and in the end - to get rid of custom link handlers like #569 (see the last screenshot. It works without the closed PR).

Then with nextcloud-libraries/nextcloud-vue#5487 it will cover all the cases. (Currently it misses only links with non-empty webroot).