fix(files): prevent dragging previews and appear as an external files DnD

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

apps/files/src/components/DragAndDropNotice.vue

@@ -115,8 +115,6 @@ export default defineComponent({
 			event.preventDefault()
 
 			const isForeignFile = event.dataTransfer?.types.includes('Files')
-
-			logger.debug('Drag over DragAndDropNotice', { isForeignFile, event })
 			if (isForeignFile) {
 				// Only handle uploading of outside files (not Nextcloud files)
 				this.dragover = true

apps/files/src/components/FileEntry.vue

@@ -466,7 +466,10 @@ export default defineComponent({
 				return
 			}
 
-			logger.debug('Drag started')
+			logger.debug('Drag started', { event })
+
+			// Make sure that we're not dragging a file like the preview
+			event.dataTransfer?.clearData?.()
 
 			// Reset any renaming
 			this.renamingStore.$reset()

apps/files/src/components/FilesListVirtual.vue

@@ -266,7 +266,6 @@ export default defineComponent({
 		onDragOver(event: DragEvent) {
 			// Detect if we're only dragging existing files or not
 			const isForeignFile = event.dataTransfer?.types.includes('Files')
-
 			if (isForeignFile) {
 				// Only handle uploading of existing Nextcloud files
 				// See DragAndDropNotice for handling of foreign files