## Summary
The core idea is as follows:
1. When a Link loads the BatteryPlugin, we query Solid for a list of batteries.
1. If the list is empty, we print a warning message and return quickly
2. Otherwise, we connect *two signals* to every object in that list
2. We send out a single new NetworkPacket as soon as we've processed that list
3. When either of those two signals emits, we send another new NetworkPacket
### Multi-battery Support
BUG: 357193
To handle devices with multiple batteries (requested in that bug), we average
together the battery percentages. This also includes a new field in the packet for
'number of batteries' called `batteryQuantity`. For backwards compatibility, we can
assume it has a default value of one.
This should ensure we support
- devices with no batteries at all (like many desktop machines)
- devices with hot-pluggable batteries (like those laptops with detachable screens)
### Concerns
Note that the implementation isn't perfect.
We'll need some new localizable text to make it clear that we now support sending
battery status information.
Then there's a rather significant question: maybe we should have two battery plugins
on each client, like we do for the `findmyphone`/`findthisdevice` plugins?
## Test Plan
We need to ensure that other clients (including those using the Android codebase)
will respond correctly. The main things to look at are
1. are these new packets sent when the plugin is enabled, and not sent when it's disabled?
2. is the charge percentage accurate?
3. is the charge state (charging, discharging, or full) accurate?
and
4. do we see the correct number of warnings for low-battery?
Creating a QRegularExpression is quite expensive and we use the same expression for each run. Sharing it between the runs leads to a significant performance improvement.
## Summary
Currently `OurSortFilterProxyModel` class is implemented in the same file with `ConversationListModel` class, which would likely grow in the future.
This MR separates `OurSortFilterProxyModel` class into its own separate file renaming it to `ConversationsSortFilterProxyModel`
https://invent.kde.org/kde/kdeconnect-kde/-/merge_requests/229
## Summary
This adds character counter below the “Send” button in SMS conversation. It
uses format XXX/Y where XXX is number of characters that can be added
without splitting the SMS into multiple messages (see article
Concatenated SMS on Wikipedia). Y is number of messages in in current
concatenated SMS. The counter is not visible when insertion of 10 7-bit
or 16-bit (depends on SMS encoding) does not create concatenated SMS.
SMS encoding is automatically guessed. 8-bit encodings are not
supported. If the message contains characters that are not supported by GSM 7-bit
encoding, counter automatically switches to UCS-2.
## Test Plan
Try entering some text that is longer than 150 characters in [GSM 03.38 encoding][1] or 60 characters in UCS-2. Number of remaining characters should be visible below the “Send” button. The character counter should show `0` at exactly 160 or 70 characters. Inserting one character should switch the counter to [Concatenated SMS][2] mode when number of messages is shown.
It should show exactly same number as SMS app in Android.
## Screenshots
These images are in APNG.
[1]: https://en.wikipedia.org/w/index.php?oldid=932080074#GSM_7-bit_default_alphabet_and_extension_table_of_3GPP_TS_23.038_/_GSM_03.38
[2]: https://en.wikipedia.org/w/index.php?oldid=943185255#Message_size
