Re: Overlay drawn on wrong file after change/folder - Nightly 5225

Molle Bestefich wrote:
>> This is a 'bug' in the shell (explorer) itself. TSVN always tells the
>> shell the correct overlay (and it *never* draws an overlay for the .svn
>> folder). The problem here is a race condition:
>> * shell asks for overlay
>> * TSVN returns the overlay index
>
> For the uninitiated, what is an "overlay index" ?

The shell has 16 overlay slots, of which the shell itself uses 4 for
itself, so 12 are open for other apps to use.
These 16 overlays are loaded on shell startup and put into the icon
cache, with the first overlay getting index 0, the second getting index
1 and so on. An overlay handler has to first tell the shell that it
wants to have one of those slots, give the shell the icon data. Then the
shell returns the index it gave the overlay handler (or an error if
there are no more slots available). After this, the overlay handler only
has to return that index whenever it wants to have the overlay drawn.

Stefan

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