DarkTheme: Fix dark theme shadows #68358
Merged
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Noticed that our z1 and z2 shadows are completely invisible in the dark theme
Compared to light theme:
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I have no memory of being like this when we launched new themes in v8 but it looks like it according to github history, so pretty confused :)
This means tooltips have no shadows in dark theme (and buttons and some other elements have no hover shadow)

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This PR proposes some z1-2 shadows that try to match the light theme shadows.
Tooltip:
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The z1 shadow on hover for buttons is barely visible still (But helps a little bit)
We don't use z2 that much (probably because it was invisible in dark theme).
One place I found is the auto complete popup for data links

Anyway. Happy to change it to something else but invisible like they are now I think is some kind of mistake :)