fix issue 2

[watermelon-neko]

result

fix #2

[timon-schelling]

This was not tested well, the tools should produce the same visual result like on https://dev.graphite.art

When drawing a rectangle like along the line (upper corner to the viewport center) the scale of the resulting rectangle is still wrong (width, height and translation seem fine).

Have your viewport zoom at something smaller that 100% to reproduce this.

what it should look like:

TL;DR: you only did one part of the issue, the second part keeping the scale at 1 still remains

[timon-schelling]

also it might be cleaner to introduce a helper function (in editor/src/messages/tool/common_functionality/utility_functions.rs) instead of duplicating the same code and leavening a comment.

[timon-schelling]

Will likely need some discussion with another maintainer, but I would like If you submit this upstream after the study.