DNSSettingsView: Disable list buttons when nothing selected

Change-Id: I2ff2ab1b3e29b1a8b217506ae620926f0f51787f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3742
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Network: Update DNSSettingsView after previous API deprecation.

Create a res_state on the stack and initialize it instead of using
the private API.

Network: Avoid DHCP over-writing user specified DNS settings

* Adds parser to servers/net/nethost, to check current
settings in resolv.conf before updating

If user has specified DNS settings manually, DHCP derived
settings are appended to resolv.conf, rather than overwriting.

(If no user specified data is present, or in the event of
a badly damaged resolv.conf, DHCP over-writes file in same
manner as prior to this change)

Fixes #11565.

Change-Id: I43464909009d2416d57f66f7bd14d13c81f803e7
Reviewed-on: https://review.haiku-os.org/c/997
Reviewed-by: Axel Dörfler <axeld@pinc-software.de>
Reviewed-by: Stephan Aßmus <superstippi@gmx.de>

DNS prefs: use thread-safe DNS settings getter

__res_state can't be used with pthreads involved, instead use
__res_get_state and __res_put_state which maintain a pool of res_state
instances.

Fixes #12195.

Avoid duplicate trnslation string in DNS settings view

As pointed out correctly by PulkoMandy. Thanks!

Small tweaks to Network prefs (DNS settings)

* Remove the BBox.
* Don't resize buttons when horizontally resizing the window.
* Compute the server address field width correctly by taking the label into
account.

Network/DNSClientService: fixed missing error check.

* CID 1251065.

Network: fixed DNS server label.

Network: made the revert button (somewhat) work.

* DNS add-on does not yet support it, the rest does.
* However, there seems to be some problems with the net_server when
changing interfaces -- not just with revert.

Network: added notify settings updated method.

* And call it from the DNS client -- this is the only add-on that does
not trigger a configuration or settings update, so we have to notify
the changes manually.

Network: added IPAddressControl.

* Based on Adrien's previous work in the DNS settings view.
* The IPv* and DNS add-ons are now using it.

Network/DNS settings: apply button, improved layout.

* The buttons now all end up with the same width.
* Put the grid into a BBox.
* The new "apply" button will actually apply the changes.

Network: DNSSettingsView style cleanup.

Network: beginnings of the DNS settings.

DNS prefs: use thread-safe DNS settings getter

__res_state can't be used with pthreads involved, instead use
__res_get_state and __res_put_state which maintain a pool of res_state
instances.

Fixes #12195.

Avoid duplicate trnslation string in DNS settings view

As pointed out correctly by PulkoMandy. Thanks!

Small tweaks to Network prefs (DNS settings)

* Remove the BBox.
* Don't resize buttons when horizontally resizing the window.
* Compute the server address field width correctly by taking the label into
account.

Network/DNSClientService: fixed missing error check.

* CID 1251065.

Network: fixed DNS server label.

Network: made the revert button (somewhat) work.

* DNS add-on does not yet support it, the rest does.
* However, there seems to be some problems with the net_server when
changing interfaces -- not just with revert.

Network: added notify settings updated method.

* And call it from the DNS client -- this is the only add-on that does
not trigger a configuration or settings update, so we have to notify
the changes manually.

Network: added IPAddressControl.

* Based on Adrien's previous work in the DNS settings view.
* The IPv* and DNS add-ons are now using it.

Network/DNS settings: apply button, improved layout.

* The buttons now all end up with the same width.
* Put the grid into a BBox.
* The new "apply" button will actually apply the changes.

Network: DNSSettingsView style cleanup.

Network: beginnings of the DNS settings.