feat(model): add underline to rich text section block element

[zimeg]

This PR adds underline to the rich text section block element style.

Category

• slack-api-model (Slack API Data Models)

Reviewers

This snippet might be useful in testing:

import com.slack.api.model.block.Blocks.*;
import com.slack.api.model.block.element.RichTextSectionElement;
import static com.slack.api.model.block.Blocks.*;
import static com.slack.api.model.block.element.BlockElements.*;
import static com.slack.api.model.block.element.RichTextSectionElement.*;

var message = RichTextSectionElement.Text.builder()
    .text("important")
    .style(TextStyle.builder().bold(true).underline(true).build())
    .build();
var response = slack.methods().chatPostMessage(r -> r.token(token)
    .blocks(asBlocks(richText(i -> i.elements(asElements(richTextSection(t -> t.elements(asRichTextElements(message))))))))
    .channel("C0123456789"));

Notes

🏁 This style has not been released to all teams yet! Hoping to have this ready to release when this does go public!

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you agree to those rules.

[zimeg]

🔍 The following appears for me when listening to an underlined app mention, as expected:

EventsApiPayloadParser.BoltEventPayload(token=WYrBcxySv439PB790UWCuV7N, enterpriseId=null, teamId=T02A074M3U3, apiAppId=A05FURW3A6R, type=event_callback, authedUsers=null, authedTeams=null, authorizations=[Authorization(enterpriseId=null, teamId=T02A074M3U3, userId=U05FURYLBT7, isBot=true, isEnterpriseInstall=false)], isExtSharedChannel=false, eventId=Ev09N61UHUJY, eventTime=1761170877, eventContext=4-eyJldCI6ImFwcF9tZW50aW9uIiwidGlkIjoiVDAyQTA3NE0zVTMiLCJhaWQiOiJBMDVGVVJXM0E2UiIsImNpZCI6IkMwNENSVUU2TVUzIn0, event=AppMentionEvent(type=app_mention, clientMsgId=9c372a7c-7cba-43a8-b3ec-684a31b24f74, user=U04051AF9NJ, username=null, appId=null, botId=null, botProfile=null, subtype=null, text=<@U05FURYLBT7> hello, blocks=[RichTextBlock(type=rich_text, elements=[RichTextSectionElement(type=rich_text_section, elements=[RichTextSectionElement.User(type=user, userId=U05FURYLBT7, style=null), RichTextSectionElement.Text(type=text, text= , style=null), RichTextSectionElement.Text(type=text, text=hello, style=RichTextSectionElement.TextStyle(bold=false, italic=false, strike=false, highlight=false, clientHighlight=false, underline=true, unlink=false, code=false))])], blockId=PZonh)], attachments=null, files=null, upload=null, displayAsBot=null, ts=1761170877.362249, team=T02A074M3U3, channel=C04CRUE6MU3, userTeam=null, sourceTeam=null, userProfile=null, edited=null, eventTs=1761170877.362249, threadTs=null))

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.43%. Comparing base (9504d94) to head (b3cf62a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1522      +/-   ##
============================================
+ Coverage     73.02%   73.43%   +0.40%     
- Complexity     4399     4403       +4     
============================================
  Files           475      475              
  Lines         14266    13947     -319     
  Branches       1452     1452              
============================================
- Hits          10418    10242     -176     
+ Misses         2987     2845     -142     
+ Partials        861      860       -1     

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[zimeg]

📰 Leaving comments for kind reviewers!

[zimeg]

🗣️ note: The line changes to json-logs are results from automated test runs!

[WilliamBergamin]

💯

[mwbrooks]

👏🏻 Huge feat to add underline support to the Java SDK as well!

[zimeg]

@WilliamBergamin @mwbrooks I share the excitement for this format! 📠

For now I will make a small change to tests then merge this since I believe support is rolled out across teams!