[api-minor] Expose the /Desc-attribute of file attachments in the viewer (issue 18030)

[Snuffleupagus]

In the viewer this will be displayed in the title of the hyperlink, which is probably the best we can do here given how the viewer is implemented.

[Snuffleupagus]

/botio test

[moz-tools-bot]

From: Bot.io (Windows)

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Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/bd1370606c2a067/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/d021206eab8145f/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/d021206eab8145f/output.txt

Total script time: 26.63 mins

• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 19
  different first/second rendering: 2

Image differences available at: http://54.241.84.105:8877/d021206eab8145f/reftest-analyzer.html#web=eq.log

[moz-tools-bot]

From: Bot.io (Windows)

---

Failed

Full output at http://54.193.163.58:8877/bd1370606c2a067/output.txt

Total script time: 40.92 mins

• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 4

Image differences available at: http://54.193.163.58:8877/bd1370606c2a067/reftest-analyzer.html#web=eq.log

[calixteman]

/botio-linux preview

[moz-tools-bot]

From: Bot.io (Linux m4)

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Received

Command cmd_preview from @calixteman received. Current queue size: 0

Live output at: http://54.241.84.105:8877/235e34223eca4b0/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Success

Full output at http://54.241.84.105:8877/235e34223eca4b0/output.txt

Total script time: 1.30 mins

Published

• Viewer: http://54.241.84.105:8877/235e34223eca4b0/web/viewer.html
• Viewer (legacy): http://54.241.84.105:8877/235e34223eca4b0/legacy/web/viewer.html

[calixteman]

The tooltip isn't displayed on nightly because of:
https://bugzilla.mozilla.org/show_bug.cgi?id=1894135
But for the rest, it looks good to me.

[calixteman]

LGTM. Thank you.