createOperations(): make filtering out of 'uninteresting' operations less aggressive (refs #1787)

'EPSG:1304, Indian 1975 to WGS 84 (2), 5.0 m, Thailand - onshore and Gulf of Thailand'
was removed because considered useless w.r.t first result
'EPSG:1812, Indian 1975 to WGS 84 (4), 3.0 m, Thailand - onshore'

However the name of the area of use is not completely the same, so might be worth
keeping it.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/iso19111/coordinateoperation.cpp b/src/iso19111/coordinateoperation.cpp
index 791bdcb0..0469cae1 100644
--- a/src/iso19111/coordinateoperation.cpp
+++ b/src/iso19111/coordinateoperation.cpp
@@ -11301,9 +11301,17 @@ struct FilterResults {
                         setOfSetOfGrids.end()) {
                         continue;
                     }
+
+                    const bool sameNameOrEmptyName =
+                        ((!curExtent && !lastExtent) ||
+                         (curExtent && lastExtent &&
+                          !curExtent->description()->empty() &&
+                          *(curExtent->description()) ==
+                              *(lastExtent->description())));
+
                     // If we have already found a operation without grids for
                     // that extent, no need to add any lower accuracy operation
-                    if (!lastHasGrids) {
+                    if (!lastHasGrids && sameNameOrEmptyName) {
                         continue;
                     }
                     // If we had only operations involving grids, but one