Dateline crossing dcw polygons and tiles (#8318)

* Fix -R for the 3 dateline-crossing countries

For odd reasons, the US, Russia and Fiji all cross the 180-meridian and yield idiotic west/east limits like 172.436/-66.9489, resulting in no plots for commands like

gmt grdimage @earth_relief_05m -B -RUS -png USA -Vi

This PR checks for this cse and now gives sensible continuous longitudes.

* Create dcw-180-crossers.sh

Add test script for the three 180-meridian DCW polygons USA, Russia, and Fiji.

* Update PS

---------

Co-authored-by: Federico Esteban <[email protected]>

src/gmt_dcw.c

@@ -900,6 +900,9 @@ struct GMT_DATASET * gmt_DCW_operation (struct GMT_CTRL *GMT, struct GMT_DCW_SEL
 			wesn[XLO] = 0.0;
 			wesn[XHI] = 360.0;
 		}
+		/* US DCW can return dumb things like this: -R172.436/-66.9489 */
+		if (wesn[XLO] > 0.0 && wesn[XHI] < 0.0)	/* Crazy US, RU, and Fiji crossing dateline and get backwards limit signs... */
+			wesn[XHI] += 360.0;
 		GMT_Report (GMT->parent, GMT_MSG_INFORMATION, "Region implied by DCW polygons is %g/%g/%g/%g\n", wesn[XLO], wesn[XHI], wesn[YLO], wesn[YHI]);
 	}
 	gmt_M_free (GMT, order);

test/baseline/grdimage.dvc

@@ -1,5 +1,5 @@
 outs:
-- md5: 226f00f8bb56bfda27786069c3ecfa19.dir
-  nfiles: 35
+- md5: 852cd5e3aed9292b7f864d0a18d207fc.dir
+  nfiles: 36
   path: grdimage
   hash: md5

test/grdimage/dcw-180-crossers.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Ensure that the region for the US, Russia and Fiji are sensible
+# when accessing tiles, i.e., 5m and higher resolutions.
+# and that maps are made. Issue only affects tiles.
+gmt begin dcw-180-crossers ps
+	gmt grdimage @earth_relief_05m -Bafg180 -RUS
+	gmt grdimage @earth_relief_05m -Bafg180 -RRU -Y7.5c
+	gmt grdimage @earth_relief_05m -Bafg180 -RFJ -Y4.5c
+gmt end show