Incorrect Current Tab toolbar theme in Mixed Mode.

[ZimCodes]

The current active tab's toolbar theme becomes completely different from the tab's overall theme in Mixed Mode. It occurs in these cases:

1. Activating/Deactivating the search widget
2. Creating tabs rapidly

Search Widget

There is a bit of weirdness with switching the search widget when in mixed mode.

bandicam.2021-10-10.10-23-36-479.mp4

Originally posted by @Unthrottled in #72 (review)

Rapid Tab Creation

There's also another case in which this issue occurs.

*Note: Sometimes when creating tabs rapidly, the last tab's toolbar theme will be different. Just switch to a different tab and back and it will resume back to normal. @ZimCodes #72

solution.mp4