I really hate to ask this ...
Don't. It's a perfectly fair and reasonable question. Yes, I did miss that section before posting.
Essentially, I wasn't looking for it because I didn't know it existed. The Canvas docs are sufficiently large that I tend to search for stuff (Arc, Oval, Line etc.) rather than scrolling through linearly.
I was looking for wherever Tk_GetGash was documented, as directed by the section of the Canvas docs I was referencing. First I searched the Canvas doc and found half a dozen references, but they are all references to it. None with an explanation.
Then I grepped the docs directories and found all the same ones in the Canvas doc, and one other that was also a reference to, not an explanation of either the information or where to find it.
If all those references to Tk_GetDash were links or references to the "Dash Patterns" section, I wouldn't have had the problem :).
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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