add mirror tool

[dujanhung]

Feature Description

problem

trying to mirror a SVG path manually would be inaccurate, tedious, and time-wasting.

proposed feature

i want to add SVG path mirror tool.

by default, the mirror is placed vertically in the middle of the canvas.

the mirror could change position and rotation. maybe it would allow grid snapping, and rotation snapping.

the action could be done via:

• select a SVG path.
• in popup menu, select mirror tool.
• finally, it's mirrored clone would appear on other side.

workarounds

on Android:

• use another app that support mirror tool, such as PainterSVG.

[MewPurPur]

Definitely want to implement this at some point. The inspector rework is also a blocker for this, because it would be a specific option, and the infrastructure for "specific options" is just not there yet.

Work around it in the meantime with things like transform=“scale(-1, 1)"

[MewPurPur]

Nevermind, actually, this should be specific to the path commands, which are an inspector element that will probably stay in its current form even through an inspector rework. So it's not blocked by that. I feel like the path commands editor is in excellent shape, so I'm open to implement it in it.