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+graphic: 0.835
+vnc: 0.809
+device: 0.711
+performance: 0.663
+network: 0.621
+semantic: 0.564
+user-level: 0.530
+virtual: 0.510
+risc-v: 0.439
+ppc: 0.431
+PID: 0.427
+mistranslation: 0.392
+kernel: 0.358
+permissions: 0.344
+files: 0.341
+arm: 0.323
+register: 0.315
+socket: 0.315
+boot: 0.311
+architecture: 0.304
+debug: 0.284
+peripherals: 0.283
+x86: 0.271
+i386: 0.260
+VMM: 0.258
+TCG: 0.248
+hypervisor: 0.224
+KVM: 0.190
+assembly: 0.150
+
+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.]
+