TTreeView memory leak (WARNING: TResourceCacheItem.IncreaseRefCount 1000 TPenHandleCache)

Original Reporter info from Mantis: jakyro

• Reporter name:

Description:

TreeView memory leak.

Create Win32/64 LCL application, add TreeView on MainForm, run and start resize MainForm until the message in console/log:

WARNING: TResourceCacheItem.IncreaseRefCount 1000 TPenHandleCache
WARNING: TResourceCacheItem.IncreaseRefCount 10000 TPenHandleCache

I tested it on Windows 10.0.10586 and 10.0.14393.

Steps to reproduce:

Windows 10.0.10586/10.0.14393
lazarus-1.6.0-fpc-3.0.0-win32/win64 2016-02-15

1. Create LCL graphical application "Menu/File/New.../Project/Application".
   Create MainForm if not created.

2. Create TreeView on MainForm and add TreeView items 1 or more.

3. Uncheck "Project Options.../Config and Target/Win32 gui application (-WG)" to see console messages OR run application with argument "--debug-log=log.txt".

4. Run application. Start resize MainForm (for repaint TreeView) from current size to zero and back, until the message (or close application to save log.txt if application running with --debug-log):

WARNING: TResourceCacheItem.IncreaseRefCount 1000 TPenHandleCache
WARNING: TResourceCacheItem.IncreaseRefCount 10000 TPenHandleCache

Additional information:

WARNING: TResourceCacheItem.IncreaseRefCount 1000 TPenHandleCache
WARNING: TResourceCacheItem.IncreaseRefCount 10000 TPenHandleCache

Mantis conversion info:

• Mantis ID: 30661
• OS: Windows
• OS Build: 10
• Build: 51630
• Version: 1.6
• Fixed in version: 1.9 (SVN)
• Fixed in revision: r55118 (#dd3f611b)
• Target version: 1.8