Perform the validation checks for every selected file and do it before starting the file uploads. Also, handle all possible error responses to the PUT requests.
Reword the help comment, add some code comments and do some minor style cleanup.
Fix warnings.
Add a help comment on the file upload dialog mentioning the extra functionality provided by google gears and a link for installing it.
Use separate progress bars next to each file, in order to better track the progress of the upload process.
Introduce TransactionHelper, a utility class for retrying the supplied transactional command in the face of rollbacks caused by optimistic lock exceptions. This allows multiple file uploads to succeed, even in a single core system.
Also make hitting the ENTER key behave the same as clicking the Upload button.
Use the shorter and more common label \"Save As\".
Merge with 3eaa2eb924fb461ee35eecb10b8ee0b0853165e0
Merge with 612ee1db5780de03ba2db24aae9513e7f28fea8a
Fix uploading file when a synonymous one is in the trash.
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