invention ideas [part 1] "why hasnt someone invented [...]"

so here are my "why hasnt someone invented [...]"

1. a music media player that allows you to shuffle back to your main song list after searching a specific song title, letter, genre, etc.
seriously, use your music player, search a song title or letter [titles are better], turn on shuffle, play the song, then press whatever button used to go to the next song, press again. the music player on your mp3 device will ONLY shuffle to songs on the list for the letter or title you typed. and if you searched a SPECIFIC title like "adelle - fire in the rain [or whatever]" thats the ONLY song the shuffle feature will play. its been almost 40 years since computers were invented and with all the advancement in technology how is it that nobody has invented or fixed this?

[FOR THE RECORD IDEAS 2-4 ARE ALL RELATED]
2. a program or update to computers and/or mobile devices that checks and compares all files you wish to move PRIOR to checking the space available to move.
this would mean that when you plan to move huge amounts of files but theres a strong possibility that many of them could be duplicates and youd be wasting time trying to whittle down the amount due to limited drive space. [i.e. you just have tons of ******, or p****, or you restored family photos, or you just have an assload of files to move, or your computer crashed and youre trying to move your files that youve backed up, or you just have tons of files and dont know whether a large percentage could be the same exact file].  a program or update to pc and mac where when moving files the device first checks all files being moved and compares them to the space moving to BEFORE checking whether the drive moving to has space. or simply a program that pc and mac could provide at a small cost that could be used to scan computers and mobile devices and any drives hooked up for any files of the same stats. [search options for comparison could be file size, name, location, type, length, folder, etc.] and this would be used BEFORE checking whether drive space is available to move said files. this way if you move 1000 files into a single location [god knows what single location would have 1000 files, maybe porn or family photos or music] the program would check the location for duplicate files BEFORE it checks for available space. this way it might say, "hey 757 of those files are already in that location so do you just want to skip them?" and thus even if a location did not have enough space for the files you could still move them there. as most of them were copies, you ACTUALLY HAD ENOUGH SPACE!

3. which brings me to this: a means through which one can just move files between sources regardless of space.
the idea is that if you want to move 15gb onto a location with only 12gb of space left, it just sifts through the files and moves them till the space available is filled. then it tells you what wasnt moved.

4. which brings me to this: when moving files, why is there not a means that shows you what was moved and not moved from the list you selected?
if there was a "highlight option" similar to the one used in microsoft office for when people edit documents online then when you moved files the list you highlighted to move could be blue, then the files moved could be highlighted red, and the ones failed to move higlighted yellow. used in junction with idea #3 and possibly idea #2 above this would make file transfer a breeze.

5. why is it that when they build dams or levis to release excess water near large rivers, oceans, and lakes, they never think to put underground drainage tunnels?
if they were to build underground drainage systems [concrete or metal tubing that went downhill ie. from above sea level to below] that were directly connected to dams and levis they could prevent things like levi breaks and floods. the idea is that in a situation like hurrcaine harvey if they had an undergound drainage pipe system [with solar panel powered pumps for backup in case the water wouldnt drain on its own] they could have diverted the excess water downstream to a resevoir or an area where it could be released into an overflow canal that led to unoccupied areas. this would cost money but would prevent any future flooding and could be an automated system that use batteries charged by solar panels and electricity. it could be set up to be activated remotely from any place that has a computer if they used a backup generator and maybe hooked it up to a computer. then if evacuations were ordered public officials could still use smartphones or any computer to activate the emergency drainage if it failed to self activate.

6. a retractable shower mat.
it somehow rolls/pulls up onto the towel rack when you are done showering.