New subject: [Bug 59448] Emulate undocumented behaviors of MS TreeView customdraw

Feb. 23, 2026

      http://bugs.winehq.org/show_bug.cgi?id=59448

            Bug ID: 59448
           Summary: Emulate undocumented behaviors of MS TreeView
                    customdraw
           Product: Wine
           Version: 11.3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: comctl32
          Assignee: wine-bugs@list.winehq.org
          Reporter: p@perkele.cc
      Distribution: ---

Created attachment 80432
  --> http://bugs.winehq.org/attachment.cgi?id=80432
Minimal repro code

MS TreeView can be made draw items with app-supplied selection state, allowing
native-looking multi-selection support.

Specifically, NM_CUSTOMDRAW CDDS_ITEMPREPAINT handler can set CDIS_SELECTED
flag, causing the item to be drawn selected.

Setting Explorer theme seems to enable the behavior, uItemState changes appear
ignored otherwise.

Wine currently does not emulate this behavior.

Recommended change: pay attention to CDDS_ITEMPREPAINT altering uItemState and
use changed state for drawing - but only if Explorer theme is set.

Test C program attached: 
* 2 tree views, left themeless, right with Explorer theme
* Custom draw handler sets CDIS_SELECTED everywhere
* Windows behavior: left ignores CDIS_SELECTED, right draws all selected

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[Bug 59448] New: Emulate undocumented behaviors of MS TreeView customdraw

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