As part of Eclipse modernization project, we have enhanced the look and
feel of Eclipse IDE. This change includes improvements to the background
color of Views and working of tabs. This has been done with reference to
the other IDEs like VS Code, Intellij etc.

Current dark theme has many issues with the background color and
contrasts. As a first step to improve dark theme, we have changed the
background color of the editor, making it the darkest when compared to
other views. Also, the working of tabs are made simple wrt to the
background colors and gradients. These changes were made by referring
other IDEs like VS Code and IntelliJ. Now, eclipse dark theme also looks
modern.