LHelp: opening the package Index page is slow, Section navigaton on the index page does not work
* Lazarus/FPC Version: <Lazarus 3.0 (rev lazarus_3_0) FPC 3.2.2 x86_64-win64-win32/win64> <!-- (Copy from Menu -> Help -> About Lazarus -> Button "Copy version information to clipboard") -->
* Operating System: <Windows 10>
* CPU / Bitness: <64> <!-- (64 or 32 Bit?) -->
## What happens
LHelp does not work properly.
## What did you expect
LHelp to work properly
## Steps to reproduce
Choose f.e. "(RTL) Runtime Library" in LHelp tree, then click "Index" in displayed page. You need a patience to wait... Now click one of the letters under "Index of all identifiers in package 'rtl' ". Nothing happens. The corresponding section is not shown.
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