When switching between tabs, either by using Ctrl+Tab, or by mouse, the editor window loses focus, making it necessary to click inside the editor with the mouse. This is especially bothersome when there's text selected in the window and I want to interact with it, because clicking to gain focus will cancel the selection. Also, middle-click doesn't make the editor gain focus, if it is lost in this way.
When switching between tabs, either by using Ctrl+Tab, or by mouse, the editor window loses focus, making it necessary to click inside the editor with the mouse. This is especially bothersome when there's text selected in the window and I want to interact with it, because clicking to gain focus will cancel the selection. Also, middle-click doesn't make the editor gain focus, if it is lost in this way.