Finally got text rendering again.

tools/tile-joiner.html

@@ -94,6 +94,9 @@
         return onBadImages('Please select 2 or more image images.');
       }
 
+      // Sort images by name to ensure consistent output
+      images = Object.fromEntries(Object.entries(images).sort(([nameA], [nameB]) => nameA.localeCompare(nameB)));
+
       elFileError.style.display = 'none';
 
       let strInfo = `Selected ${Object.keys(images).length} images:\n`;
@@ -119,7 +122,16 @@
         outputHeight = firstHeight;
         outputWidth = nextPowerOfTwo(Object.values(images).reduce((sum, img) => sum + img.width, 0));
       } else {
-        onBadImages('All images must share the same width or height, and that dimension must be a power of two.');
+        if(allImagesShareWidth) {
+          outputWidth = nextPowerOfTwo(firstWidth);
+          outputHeight = nextPowerOfTwo(Object.values(images).reduce((sum, img) => sum + img.height, 0));
+        } else if(allImagesShareHeight) {
+          outputHeight = nextPowerOfTwo(firstHeight);
+          outputWidth = nextPowerOfTwo(Object.values(images).reduce((sum, img) => sum + img.width, 0));
+        } else {
+          onBadImages('All images must share the same width or height to be joined together.');
+          return;
+        }
       }
 
       // Update preview