Fix script editor caret position

CHANGELOG.md

@@ -11,6 +11,7 @@ This is a work-in-progress for the next QuPath release.
 * 'Run for project' does not recognize when previous images have been deleted (https://github.com/qupath/qupath/issues/1291)
 * ProjectCommands.promptToImportImages always returns an empty list (https://github.com/qupath/qupath/issues/1251)
 * PathIO doesn't restore backup if writing ImageData fails (https://github.com/qupath/qupath/issues/1252)
+* Scripts open with the caret at the bottom of the text rather than the top (https://github.com/qupath/qupath/issues/1258)
 
 ### Dependency updates
 * Bio-Formats 7.0.0

qupath-gui-fx/src/main/java/qupath/lib/gui/scripting/ScriptTab.java

@@ -104,6 +104,7 @@ protected void readFile(final File file) throws IOException {
 		logger.info("Loading file {} to Script Editor", file.getAbsolutePath());
 		String content = GeneralTools.readFileAsString(file);
 		editor.setText(content);
+		editor.positionCaret(0); // Reposition caret to the beginning of the file
 		name = file.getName();
 		this.file = file;
 		lastModified = file.lastModified();

qupath-gui-fx/src/main/java/qupath/lib/gui/viewer/ViewerManager.java

@@ -299,7 +299,7 @@ public Region getRegion() {
 		if (splitPaneGrid == null) {
 			// Create a reasonably-sized viewer
 			QuPathViewerPlus defaultViewer = createViewer();
-			this.viewers.add(defaultViewer);
+//			this.viewers.add(defaultViewer);
 			if (defaultViewer != null)
 				defaultViewer.addViewerListener(this);
 			setActiveViewer(defaultViewer);