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* Fix input files being overwritten by newly uploaded files - Fix a bug that caused existing selected/uploaded files to be overwritten when a new input file is uploaded through input element. - Add source property to change event to differentiate between uploaded files using input element and drag/drop uploads to avoid processing drag/drop files more than once, thus avoiding file duplication (file duplication resulting from copying drop/drop files to input files on each 'change' event). * Dispatch and use file-input-change instead of change event for merging - Dispatch "file-input-change" event after each "change" event in file upload, to notify other functions/components relying on the files provided by the \<input\> element. - Use "file-input-change" instead of "change" event to display the latest version of uploaded files. # FAQ: - Why use "file-input-change" instead of "change" in merge.js? = "change" event is automatically triggered when a file is uploaded through \<input\> element which would replace all the existing selected/uploaded files including the drag/drop files. ## Example: Let's say that the user wants to upload/select the x.pdf, y.pdf and z.pdf all together: - user selects "x.pdf" -> file selected successfully. = selected files: x.pdf - user drags and drops "y.pdf" -> file dropped successfully = selected files: x.pdf, y.pdf - user selects again using \<input\> "z.pdf" -> file selected succesfully overwriting selected files. = selected files: z.pdf