[Fixed] Segfaults when using "Make a thick solid" tool

[wmayer]

2. The operation will fail, if not, make something that cannot be computed and

It doesn't matter if the thickness can be computed or not. E.g. you can create a standard PD box and select one of its faces. The thickness tool is able to succeed the operation but when clicking on Cancel the application crashes, too.

[wmayer]

This fixes the crash: git commit ff0f8b0d8

[realthunder]

This fixes the crash: git commit ff0f8b0d8

I also did a fix, but then found out that you've beat me to it.

I also fixed another minor problem and submitted a PR here. It happened when I test the file attached here. The property editor did a redundant recompute when closing a transaction that is opened by the part design task panel.

[wmayer]

I also fixed another minor problem and submitted a PR here. It happened when I test the file attached here.

I have observed this behaviour too and each time you switch from Tree/Property view to the Task view a recompute was performed. With the very small attached test project from Leo it took 2s in the debug mode. So, thanks for the quick fix.

[leoheck]

And thanks for all the fixes, you are great guys.