JDK-8295729 was created in an attempt to remove all trailing whitespace from properties files, and enable a jcheck verification that they did not come back, similar to other source code. It turned out that this was not so simple, however, since trailing whitespace in values is actually significant in properties files.

To address this, I have opened four bugs on different component teams to either remove the trailing significant whitespace (if it is there erroneously), or convert it to the unicode sequence `\u0020`: JDK-8298042, JDK-8298044, JDK-8298045 and JDK-8298046.

That leaves all the other trailing spaces, in blank lines and in the end of comments. These serve no purpose and should just be removed, and is what this issue concerns.

When this and the four "significant whitespace" bugs are all finally integrated, we can finally turn on the verification in jcheck for properties files as well.