If sidebar button is in compact mode, left most button/icon will be on top of sidebar

1. Put sidebar button in tab bar, anywhere except left most position.

2. Activate the sidebar either by clicking the sidebar button or mouse over the left edge, the left most icon (it can be button or extension icon) is left on top of the sidebar

3. This does not happen if sidebar button is not in the tab bar

Suggestion/Expectation: Made the sidebar not cover the tab bar, so no change to the tab bar when activating the sidebar.

Version 0.99.131.2-rc (WebKit 621.1.2.111.4)

Sequoia (15)