refactor: Use 'system2()' and suppress 'convert' error messages

* Use 'system2()' and suppress 'convert' error messages
 in internal `fill_area_with_img_tile()`

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: gridpattern
 Type: Package
 Title: 'grid' Pattern Grobs
-Version: 0.5.0-9
+Version: 0.5.0-10
 Authors@R: c(person("Mike", "FC", role = "aut", comment = "Code/docs adapted from ggpattern"),
         person("Trevor L", "Davis", role=c("aut", "cre"), email="[email protected]"),
         person("Thomas Lin", "Pedersen", role = "ctb", comment = "new_data_frame() copied from ggplot2"))

R/utils-magick-fill.R

@@ -189,9 +189,12 @@ fill_area_with_img_tile <- function(img, width, height, filter = filter, scale =
 # requires `convert` command-line tool which tends to choke on Windows
 tile_image_via_convert <- function(tile_temp_filename, width, height) {
     tmp_filename <- tempfile(fileext = ".png")
-    command <- glue("convert -size {width}x{height} tile:'{tile_temp_filename}' ",
-                  "-background none {tmp_filename}")
-    system(command)
+    command <- "convert"
+    args <- c("-size", glue("{width}x{height}"),
+              glue("tile:'{tile_temp_filename}'"),
+              "-background", "none",
+              tmp_filename)
+    system2(command, args, stdout = FALSE, stderr = FALSE)
     magick::image_read(tmp_filename)
 }