Always show merge&move operations in context menu.

Previously, we calculated whether there are at least two albums so that
we can actually perform the operation. Due to subalbums this simple
check is not sufficient anymore. Since the rules are more complicated
and we don't have all albums loaded at that point to calculate it
properly, this commit removes the check entirely and always displays
the operations.

The only disadvantage is that if an installation really has just one
album (should rarely happen), the user still sees the merge operation
(not merge all), which results in an album-list with one disabled album.
I think this is okay.

src/scripts/contextMenu.js

@@ -135,13 +135,10 @@ contextMenu.album = function(albumID, e) {
 
 	if (album.isSmartID(albumID)) return false
 
-	// Show merge-item when there's more than one album
-	let showMerge = (albums.json && albums.json.albums && Object.keys(albums.json.albums).length>1)
-
 	let items = [
 		{ title: build.iconic('pencil') + 'Rename', fn: () => album.setTitle([ albumID ]) },
-		{ title: build.iconic('collapse-left') + 'Merge', visible: showMerge, fn: () => { basicContext.close(); contextMenu.mergeAlbum(albumID, e) } },
-		{ title: build.iconic('folder') + 'Move', visible: showMerge, fn: () => { basicContext.close(); contextMenu.moveAlbum([ albumID ], e) } },
+		{ title: build.iconic('collapse-left') + 'Merge', fn: () => { basicContext.close(); contextMenu.mergeAlbum(albumID, e) } },
+		{ title: build.iconic('folder') + 'Move', fn: () => { basicContext.close(); contextMenu.moveAlbum([ albumID ], e) } },
 		{ title: build.iconic('trash') + 'Delete', fn: () => album.delete([ albumID ]) }
 	]
 
@@ -159,14 +156,11 @@ contextMenu.albumMulti = function(albumIDs, e) {
 	// Show list of albums otherwise
 	let autoMerge = (albumIDs.length>1 ? true : false)
 
-	// Show merge-item when there's more than one album
-	let showMerge = (albums.json && albums.json.albums && Object.keys(albums.json.albums).length>1)
-
 	let items = [
 		{ title: build.iconic('pencil') + 'Rename All', fn: () => album.setTitle(albumIDs) },
-		{ title: build.iconic('collapse-left') + 'Merge All', visible: showMerge && autoMerge, fn: () => album.merge(albumIDs) },
-		{ title: build.iconic('collapse-left') + 'Merge', visible: showMerge && !autoMerge, fn: () => { basicContext.close(); contextMenu.mergeAlbum(albumIDs[0], e) } },
-		{ title: build.iconic('folder') + 'Move All', visible: showMerge, fn: () => { basicContext.close(); contextMenu.moveAlbum(albumIDs, e) } },
+		{ title: build.iconic('collapse-left') + 'Merge All', visible: autoMerge, fn: () => album.merge(albumIDs) },
+		{ title: build.iconic('collapse-left') + 'Merge', visible: !autoMerge, fn: () => { basicContext.close(); contextMenu.mergeAlbum(albumIDs[0], e) } },
+		{ title: build.iconic('folder') + 'Move All', fn: () => { basicContext.close(); contextMenu.moveAlbum(albumIDs, e) } },
 		{ title: build.iconic('trash') + 'Delete All', fn: () => album.delete(albumIDs) }
 	]