Trenchbroom: Valve: expose alternate Alt+Click behaviour in UI

[ericwa]

The left side is the current Alt+Click behaviour, that mimics Standard texture format. We could possibly offer the behaviour on the right with Alt+Right click (or Alt+Middle Click), which avoids distorting the texture.

The code for the right side is in ParallelTexCoordSystem::doUpdateNormalWithRotation (currently unused). Would just need to call it from BrushFace::copyTexCoordSystemFromFace.

[kduske]

@ericwa let's roll this into 2.0.0 since it kind of belongs to the improvements to Valve 220

[ericwa]

Cool, I should be able to put together a PR for this tonight. Does Alt+Right click sound good?

[muk0r]

Alt+right would mimic how "wrapping without distorting" is achieved in both Hammer and JACK.

[kduske]

I'd rather see shift+alt-left, since it's just a modification of the standard behavior, thus a modification of the standard shortcut seems appropriate:

• alt+left: standard copy of texture and attributes
• ctrl+alt+left: copy of texture only without parameters
• shift+left: new copy of texture and attributes

Please also consider to implement the double click variant (apply to all faces of a brush instead of the one under the mouse).