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+vnc: 0.176
+other: 0.173
+semantic: 0.115
+graphic: 0.098
+device: 0.085
+network: 0.065
+performance: 0.060
+PID: 0.052
+debug: 0.040
+files: 0.035
+permissions: 0.028
+socket: 0.028
+boot: 0.026
+KVM: 0.019
+vnc: 0.410
+graphic: 0.285
+debug: 0.112
+network: 0.039
+other: 0.034
+files: 0.030
+performance: 0.022
+device: 0.019
+semantic: 0.016
+socket: 0.010
+PID: 0.008
+boot: 0.007
+permissions: 0.006
+KVM: 0.002
+
+VNC outputs garbage in zlib mode
+
+TL;DR: When QEMU is launched with VNC as the output and viewed with a client that defaults to zlib VNC encoding, the resulting output tends to accumulate artifacts.
+
+Reproduction:
+Launch QEMU (tried with versions 4.2.0 and 4.1.0 on Linux  64bit) with -vnc 0.0.0.0:0
+Connect to it with a VNC client that allows you to select encoding, i.e. UltraVNC.
+Set encoding to zlib (type 6), 32bit color.
+As screen content changes it starts accumulating artifacts. Almost certain to appear if you open-close windows over a pattern.
+Does not seem to depend on guest used, but easier to reproduce with a GUI.
+
+Looks like this: https://orbides.org/img/vnc.png
+
+It appears to be a deflate glitch of some sort - all of the bad pixels are generated by length/distance codes. Can't narrow it down any more.
+
+The QEMU project is currently considering to move its bug tracking to
+another system. For this we need to know which bugs are still valid
+and which could be closed already. Thus we are setting older bugs to
+"Incomplete" now.
+
+If you still think this bug report here is valid, then please switch
+the state back to "New" within the next 60 days, otherwise this report
+will be marked as "Expired". Or please mark it as "Fix Released" if
+the problem has been solved with a newer version of QEMU already.
+
+Thank you and sorry for the inconvenience.
+
+
+[Expired for QEMU because there has been no activity for 60 days.]
+