Results in small UI changes, but allows us to delete a lot
of code duplication.
Depends-On: I9049f5a1c0d88680fc4a174e390dd08e27c0eee2
Change-Id: Iebe7bdc8a026b929a35e823d8107d90e7bb62b82
Really, why should this be forbidden? These onclick handlers do waaaaay
to much. They do not only block what they should block, they block way
more stuff, like resizing the textarea and interacting with it in any
way that involves the mouse. This is not the intention of this code.
I'm sorry to say that, but this code is the equivalent of "disable
right click to prevent stealing images" on 1990s web pages. Please,
please let's not do this. Let the user do what he expectes and is used
to do.
Bug: T110579
Change-Id: Ia89faea678606d5c382539f726e2edaa745c904e
