With the changes in PR 11077, the zoom dropdown now looks "squashed" in locales with longer than average zoom-strings[1]. The reason is that the zoom-value and the dropdown-icon are too close together, which doesn't look good in affected locales.
To fix this, the following changes are made:
- Increase the calculated dropdown width, in `Toolbar._adjustScaleWidth`, to account for the much wider icon (7 px -> 16 px) and the increased padding.
- Move the dropdown-icon *slightly* outwards, and also *slightly* reduce the left (right in RTL locales) padding of the dropdown-contents.
- Finally, remove the right (left in RTL locales) padding to reduce the chance of the *default* browser dropdown-icon being visible.
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[1] This affects e.g. the `de` and `nl` locales, but there's probably other examples as well.
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