Add info URL parameter

To change information string on the top of hpainter

Author: linev

docs/JSROOT.md

@@ -52,6 +52,7 @@ To automate files loading and objects drawing, one can provide number of URL par
 - palette - id of default color palette, 51..121 - new ROOT6 palette  (default 57)
 - interactive - enable/disable interactive functions 0 - disable all, 1 - enable all
 - noselect - hide file-selection part in the browser (only when file name is specified)
+- info - information text displayed on the top of hierarchy browser
 - mathjax - use MathJax for latex output
 - latex - 'off', 'symbols', 'normal', 'mathjax', 'alwaysmath' control of TLatex processor
 - style - name of TStyle object to define global JSROOT style

modules/gui/HierarchyPainter.mjs

@@ -3802,6 +3802,7 @@ class HierarchyPainter extends BasePainter {
          browser_kind = 'float';
 
       this.no_select = getOption('noselect');
+      this.top_info = getOption('info');
 
       if (getOption('files_monitoring') !== null)
          this.files_monitoring = true;
@@ -4092,7 +4093,7 @@ class HierarchyPainter extends BasePainter {
 
       this.brlayout.setBrowserContent(guiCode);
 
-      const title_elem = this.brlayout.setBrowserTitle(this.is_online ? 'ROOT online server' : 'Read a ROOT file');
+      const title_elem = this.brlayout.setBrowserTitle(this.top_info || (this.is_online ? 'ROOT online server' : 'Read a ROOT file'));
       title_elem?.on('contextmenu', evnt => {
          evnt.preventDefault();
          createMenu(evnt).then(menu => {