Show hover elements when keyboard focus is within an event tile (#31078)

* Show timestamps when keyboard focus is within an event tile

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Ensure toolbar navigation pattern works in MessageActionBar

This requires all buttons within to be roving by using the ref callback given by useRovingTabIndex

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Use PureComponent in EventTile to avoid mass re-rendering due to transitive onFocus/onBlur calls

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove unused timestamp event tile prop

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Use MessageTimestamp to generate the wrapping anchor so that focusing it brings up the tooltip

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Tweak MessageTimestamp

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Switch back to Component as we specify a shouldComponentUpdate already

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update jest tests

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update playwright timestamp masks

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Revert snapshot

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshot

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix IRC layout

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Use PureComponent in EventTile to avoid mass re-rendering due to transitive onFocus/onBlur calls

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove unused timestamp event tile prop

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Use MessageTimestamp to generate the wrapping anchor so that focusing it brings up the tooltip

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Tweak MessageTimestamp

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Switch back to Component as we specify a shouldComponentUpdate already

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update jest tests

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update playwright timestamp masks

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Revert snapshot

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshot

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix IRC layout

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Lint styles

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix layout picker

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update snapshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update screenshots

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix pcss comment

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate Playwright

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate Playwright

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

res/css/views/messages/_MessageTimestamp.pcss

@@ -13,13 +13,14 @@ Please see LICENSE files in the repository root for full details.
 }
 
 .mx_MessageTimestamp {
-    color: var(--MessageTimestamp-color);
+    color: var(--MessageTimestamp-color) !important; /* override anchor color */
     font-size: $font-10px;
     font-variant-numeric: tabular-nums;
     display: block; /* enable the width setting below */
     width: var(--MessageTimestamp-width);
     white-space: nowrap;
     user-select: none;
+    text-decoration: none;
 }
 
 .mx_MessageTimestamp_lateIcon {