Created attachment 460374 [details]
small c program which demonstrates the problem
Description of problem:
the attached file demonstrates the problem. (I encountered it while developing a program to do things with the Mandelbrot set.) You should always see a polygonal figure but sometimes areas are filled black
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Compile and run to get an empty window,
2. left-click to get a figure which always draws correctly and
3. right-click to get one which looks very similar but misbehaves. To see this, try resizing the window, minimizing and maximizing, hiding under another window etc.
polygonal figures, some areas filled. See attached images.
Changing the constant term 1.4 in the function draw_iter() makes the program behave correctly (for these starting points).
Created attachment 461160 [details]
even shorter test program
In this case the coordinates of the points are coded explicitly. I have tried varying the values and in some cases larger variations are possible before the incorrect redraw problem vanishes.
Note that the first line drawn almost but not quite coincides with the last and the second and third lines. If the numbers are made exactly the same, the problem goes away!
Created attachment 468174 [details]
Put the drawing commands in a separate function and it works ok!
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