feat: Add SearchController for PDF text search, navigation, and highlighting.

Author: JuliusBairaktaris

viewer/js/search_controller.js

@@ -77,13 +77,23 @@ export class SearchController {
                 }
 
                 if (matchesOnPage.length > 0) {
+                    // Store the current match object before modification/sorting
+                    const currentMatchBeforeSort = (this.currentMatchIndex !== -1 && this.currentMatchIndex < this.matches.length)
+                        ? this.matches[this.currentMatchIndex]
+                        : null;
+
                     this.matches.push(...matchesOnPage);
                     // Sort matches by page order to keep navigation logical
                     this.matches.sort((a, b) => {
                         if (a.pageNum !== b.pageNum) return a.pageNum - b.pageNum;
                         return a.matchIdx - b.matchIdx;
                     });
 
+                    // Restore the correct index for the previously selected match
+                    if (currentMatchBeforeSort) {
+                        this.currentMatchIndex = this.matches.indexOf(currentMatchBeforeSort);
+                    }
+
                     // If this is the *very first* match we found in this session, highlight it safely
                     if (!firstMatchFound) {
                         firstMatchFound = true;