[Merge] lp:~fboucault/ubuntu-ui-extras/fix_left_counter into lp:ubuntu-ui-extras/staging

[Florian Boucault]

Florian Boucault has proposed merging lp:~fboucault/ubuntu-ui-extras/fix_left_counter into lp:ubuntu-ui-extras/staging.

Commit message:
Recompute 'indexFirstVisibleItem' whenever tabs.width changes. Fixes cases where the number of invisible tabs on the left is incorrect.

Requested reviews:
  system-apps-ci-bot (system-apps-ci-bot): continuous-integration
  Andrew Hayzen (ahayzen)
Related bugs:
  Bug #1672444 in ubuntu-ui-extras (Ubuntu): "Negative number of tabs at left of the browser"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-extras/+bug/1672444

For more details, see:
https://code.launchpad.net/~fboucault/ubuntu-ui-extras/fix_left_counter/+merge/321989

Recompute 'indexFirstVisibleItem' whenever tabs.width changes. Fixes cases where the number of invisible tabs on the left is incorrect.
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