Clipboard.copy: deal with end spaces manually without a regexp
Clipboard.copy: deal with end spaces manually without a regexp

RegExp is too slow for large strings:
* test `fs.read('content/vomnibar.js').trim() + ' '.repeat(20)`
* re: 19892.166ms; trimEnd: 696.776ms

Only trimEnd single line string if it does not start with a space

gdh1995/vimium-plus,gdh1995/vimium-plus,gdh1995/vimium-plus