D8208: Add Duplicate feature

[Nathaniel Graham]

ngraham created this revision.
Restricted Application added a subscriber: Dolphin.

REVISION SUMMARY
  Adds a Duplicate feature to Dolphin, showing up as a menu item in the File menu that appears when one or more items are selected and the directory is writable. Duplicated items receive the names of the original files with " copy" appended before the file extension, if any. If only one item was duplicated, a rename operation is immediately initiated on it, allowing the user to choose a new name.

TEST PLAN
  Tested in KDE Neon.
  
  F5201386: Duplicate.png <https://phabricator.kde.org/F5201386> F5201393: Duplicates.png <https://phabricator.kde.org/F5201393>
  
  Test cases:
  
  - Try to duplicate when nothing is selected: **PASS**: menu item is grayed out
  - Try to duplicate anything on a read-only local volume: **PASS**:  menu item is grayed out
  - Try to duplicate anything on a read-only samba share: **PASS**: menu item is grayed out
  - Duplicate single local file on R/W volume: **FAIL**: item is duplicated and named correctly, but and a rename operation is not initiated
  - Duplicate multiple local files on R/W volume: **PASS**: 3 items are duplicated, named correctly, and selected
  - Duplicate single local directory on  R/W volume: **PASS**: item is duplicated and named correctly, but a rename operation is not initiated
  - Duplicate multiple local directories on R/W volume: **PASS**: 3 items are duplicated, named correctly, and selected
  - Duplicate single file on R/W samba share: **FAIL**: item is duplicated and correctly, but a rename operation is not initiated
  - Duplicate multiple files on R/W samba share: **PASS**: 3 items are duplicated, named correctly, and selected
  - Duplicate single directory on R/W samba share: **FAIL**: item is duplicated and named correctly, but a rename operation is not initiated
  - Duplicate multiple directory on R/W samba share: **PASS**: 3 items are duplicated, named correctly, and selected
  - Try to undo a successful duplication: **PASS**: operation is undone
  
  The failures are due to an issue where the newly-created items are not added in time to the underlying KFileItemModel. I could use some pointers on fixing this.
  
  This is my first attempt at a big change like this and I'm sure it's full of other issues. I will accept any and all suggestions for improvement. :)

REPOSITORY
  R318 Dolphin

BRANCH
  arcpatch-D8206

REVISION DETAIL
  https://phabricator.kde.org/D8208

AFFECTED FILES
  src/dolphinmainwindow.cpp
  src/dolphinui.rc
  src/views/dolphinview.cpp
  src/views/dolphinview.h
  src/views/dolphinviewactionhandler.cpp
  src/views/dolphinviewactionhandler.h

To: ngraham
Cc: #dolphin
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