Success! Looks like we've fixed this one. According to our records the fix was applied for
EXTGWT-4446
in
4.0.
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Sencha Premium Member
Triton theme: over style for inactive tab changes height
You can notice it in the examples: http://examples.sencha.com/gxt/ea/4.0.0/examples/.
If you open just 1 tab, so that you have the fixed "Overview" tab and another one, then passing over the inactive tab with the mouse results in a height change.
The same does not apply when you have more than 2 tabs opened or when you switch theme.
Hope this helps!
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Sencha User
Thanks for the report! I'll file an issue.