Not possible to set custom extent with "ext" argument of frames_spatial()

[markbidwell]

Specifying a custom extent with the "ext" argument of frames_spatial() doesn't result in a modified extent. Here is a reprex:

library(moveVis)
library(move)
library(raster)
library(ggplot2)

data("move_data")
move_data <- align_move(move_data, res = 4, unit = "mins")

With default extent (equidistant = TRUE)

frames <- frames_spatial(move_data, path_colours = c("red", "green", "blue"),
map_service = "osm", map_type = "streets", alpha = 0.5, equidistant=T)
length(frames) # number of frames
frames[[100]] # display one of the frames; extent is square (good)

With default extent (equidistant = FALSE)

frames <- frames_spatial(move_data, path_colours = c("red", "green", "blue"),
map_service = "osm", map_type = "streets", alpha = 0.5, equidistant=F)
length(frames) # number of frames
frames[[100]] # display one of the frames; extent is rectangular (good)

With CUSTOM extent - this doesn't work

extent(move_data) #inspect default extent
(ext <- extent(8.1, 9.9, 47.1, 47.9)) #specify and inspect custom extent, note that it's BIGGER than the default original extent
frames <- frames_spatial(move_data, path_colours = c("red", "green", "blue"),
map_service = "osm", map_type = "streets", map_res = 0.8, ext = ext, equidistant = F)
frames[[100]] # display one of the frames; NOTE that the extent hasn't changed, despite calling a different extent