Fix line and page out of bounds after content update

Author: NichtStudioCode

invui-core/src/main/java/xyz/xenondevs/invui/gui/AbstractPagedGui.java

@@ -70,6 +70,12 @@ private int correctPage(int page) {
         return Math.max(0, Math.min(page, getPageAmount() - 1));
     }
 
+    private void correctCurrentPage() {
+        int correctedPage = correctPage(currentPage);
+        if (correctedPage != currentPage)
+            setPage(correctedPage);
+    }
+    
     @Override
     public boolean hasNextPage() {
         return currentPage < getPageAmount() - 1 || infinitePages;
@@ -81,6 +87,7 @@ public boolean hasPreviousPage() {
     }
 
     protected void update() {
+        correctCurrentPage();
         updateControlItems();
         updatePageContent();
     }

invui-core/src/main/java/xyz/xenondevs/invui/gui/AbstractScrollGui.java

@@ -80,6 +80,12 @@ private int correctLine(int line) {
         return Math.max(0, Math.min(line, getMaxLine()));
     }
 
+    private void correctCurrentLine() {
+        int correctedLine = correctLine(currentLine);
+        if (correctedLine != currentLine)
+            setCurrentLine(correctedLine);
+    }
+    
     @Override
     public boolean canScroll(int lines) {
         if (lines == 0 || (infiniteLines && lines > 0) || (lines < 0 && getCurrentLine() > 0)) return true;
@@ -104,6 +110,7 @@ public void scroll(int lines) {
     }
 
     protected void update() {
+        correctCurrentLine();
         updateControlItems();
         updateContent();
     }