Prevent future date selection in jump to date

[MadLittleMods]

Prevent future date selection in jump to date. You can still type in whatever date you want (native date input behavior) but the UI picker has future dates disabled.

Fix element-hq/element-web#20800

Testing strategy

1. Ensure you're using a homeserver with stable support for /timestamp_to_event (Synapse 1.73.0+, 2022-12-06)
2. Sorry, this next step is hard because Synapse currently doesn't advertise stable support for Matrix v.1.6 yet (related Element issue)
3. Enable the Labs feature toggle manually by updating the forcedValue to true in src/settings/Settings.tsx#L366-L379. We can't just enable/disable via mxSettingsStore in devtools because "disabled" features can't be enabled/disabled. Here is an example how to edit Settings.tsx:

       "feature_jump_to_date": {
           isFeature: true,
           labsGroup: LabGroup.Messaging,
           displayName: _td("Jump to date (adds /jumptodate and jump to date headers)"),
           supportedLevels: LEVELS_FEATURE,
           default: false,
           controller: new ServerSupportUnstableFeatureController(
               "feature_jump_to_date",
               defaultWatchManager,
               [["org.matrix.msc3030"], ["org.matrix.msc3030.stable"]],
               "v1.6",
               _td("Requires your server to support MSC3030"),
   +           true,
           ),
       },

4. Refresh Element so the jump to date headers show up
5. Open the context menu of one of the jump to date headers
6. Use the the date picker option at the bottom and notice that dates in the future are not pickable (disabled).

Dev notes

References:

• https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date#value
• https://developer.mozilla.org/en-US/docs/Web/HTML/Date_and_time_formats#date_strings
• https://en.wikipedia.org/wiki/ISO_8601

Checklist

• Tests written for new code (and old code if feasible)
• Linter and other CI checks pass
• Sign-off given on the changes (see CONTRIBUTING.md)

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Here's what your changelog entry will look like:

🐛 Bug Fixes

• Prevent future date selection in jump to date (#10419). Fixes Jump to date picker lets you try to jump into the future element-hq/element-web#20800. Contributed by @MadLittleMods.

[richvdh]

I wasn't able to test this because it requires server-side experimental support, but it looks great!

[MadLittleMods]

Thanks for the review @richvdh 🐮

[MadLittleMods]

I wasn't able to test this because it requires server-side experimental support, but it looks great!

@richvdh I've updated the description with a "Testing strategy" of how you can enable and try it out. Sorry for not including this originally.