ksnapshot: declare text/uri-list format when drag&droppingHEADmaster

This enables drag&dropping screenshots directly into a browser window.
As a side effect when drag&dropping into most file managers (into
konquerror in particular) this will also cause them to copy a png file
instead of asking a user in what format they would like to save the
image.

Besides that commit includes:
- Rework of handling of temporary files, in particular:
  - Temporary files now try to use a friendlier names with timestamps
    e.g. `snapshot-20251108-211852.png`. And fallback to use
    `mkstemp()`-style suffix if the name already in use.
  - When "Open with" is issued several times the temporary file will be
    created only once.
  - If the file was already saved by the user ksnapshot won't create an
    additional temporary one for drag&drop or "Open with", but rather
    use the saved one.
  - "Open with" temporary files are no longer removed after the process
    terminates, but are kept around until exit from ksnapshot. Removing
    the files right after process termination caused failures to open
    the file when they were passed to another (already running) instance
    of a program instead of a new one (e.g. in gimp).
- Some refactoring for code deduplocation.
- Some helper classes.

Closes: https://mirror.git.trinitydesktop.org/gitea/TDE/tdegraphics/issues/135
Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

0 files changed, 0 insertions, 0 deletions