Synfig: Ask for confirmation before overwriting exported target

[FirasH]

Synfig version & platform:
Master: ccf39ec

Issue description:
When exporting an animation to any arbitrary target, Synfig Studio never informs the user if the action is going to overwrite an existing file.

I suggest to add one check (for example with a popup dialog), before proceeding with the rendering of the target.

---

Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.

[FirasH]

If overwriting an existing animation .sif project a confirmation dialog will popup.
It could be a great place to start with and to get an idea of how it works.

Source code:
https://github.com/synfig/synfig/blob/c51cef4a4381edc249884c2ff4fd2efdb94b69c4/synfig-studio/src/gui/instance.cpp#L527-L562

[FirasH]

Looked a bit at the code and the solution should be very close to the one already reported in the previous comment... Working on it to test if it works correctly.

[FirasH]

Things get a bit tricky in case of sequences.
It's needed to take into account the sequence separator string and the time numbering.

[FirasH]

I've made some tests and ended up with something that appears to work consistently.

I'll report here a merge request as soon as the solution is tested and cleaned (if it's ever going to work :wink:)