Implement texture frame mirror painting option

Closes #1156
Fix issue with stretched texture in UV editor while painting

js/animations/timeline.js

@@ -496,7 +496,6 @@ const Timeline = {
 				Timeline.pause()
 			} else {
 				Timeline.setTime(0)
-				Timeline.start()
 			}
 		}
 	},

js/texturing/painter.js

@@ -568,7 +568,6 @@ const Painter = {
 		ctx.globalCompositeOperation = 'source-over'
 	},
 	getMirrorPaintTargets(texture, x, y, uvTag) {
-		if (!uvTag || !Painter.current.element) return;
 		function getTargetWithOptions(symmetry_axes, local) {
 			let mirror_element = local ? Painter.current.element : Painter.getMirrorElement(Painter.current.element, symmetry_axes);
 			let even_brush_size = BarItems.slider_brush_size.get()%2 == 0 && Toolbox.selected.brush?.offset_even_radius && Condition(Toolbox.selected.brush?.floor_coordinates);
@@ -681,7 +680,9 @@ const Painter = {
 				}
 			}
 		}
+		
 		let targets = [];
+		if (uvTag & Painter.current.element) {
 			let mirror_vectors = [[
 				Painter.mirror_painting_options.axis.x?1:0,
 				Painter.mirror_painting_options.axis.y?1:0,
@@ -710,7 +711,29 @@ const Painter = {
 					targets.push(getTargetWithOptions(mirror_vector, true));
 				}
 			})
+		}
 		// Texture animation
+		if (Painter.mirror_painting_options.texture_frames && Format.animated_textures && texture && texture.frameCount > 1) {
+			let spatial_targets = targets.slice();
+			for (let frame = 0; frame < texture.frameCount; frame++) {
+				if (frame == texture.currentFrame) continue;
+
+				targets.push({
+					element: Painter.current.element,
+					x,
+					y: y + (frame - texture.currentFrame) * texture.display_height,
+					face: Painter.current.face
+				});
+				spatial_targets.forEach(spatial => {
+					targets.push({
+						element: spatial.element,
+						x: spatial.x,
+						y: spatial.y + (frame - texture.currentFrame) * texture.display_height,
+						face: spatial.face
+					});
+				})
+			}
+		}
 		return targets.filter(target => !!target);
 	},
 	drawBrushLine(texture, end_x, end_y, event, new_face, uv) {

js/texturing/uv.js

@@ -1908,6 +1908,8 @@ Interface.definePanels(function() {
 					if (this.texture && this.texture.display_canvas) {
 						Vue.nextTick(() => {
 							let wrapper = this.$refs.texture_canvas_wrapper;
+							this.texture.canvas.style.objectPosition = `0 ${-this.texture.currentFrame * this.inner_height}px`;
+							this.texture.canvas.style.objectFit = this.texture.frameCount > 1 ? 'cover' : 'fill';
 							wrapper.append(this.texture.canvas);
 						})
 					}