Control: tags -1 unreproducible I've tried to reproduce the issue for 48h on three AMD64 systems I've happened to have around here temporarily with fresh Debian testing installs. Got to use the opportunity. One of the systems was used for heavy editing, the two other for occasional editing with lots of idle times. The theme was set to oblivion on mousepad invocation as instructed by the bug submitter. There were no crashes and no uninstructed switch of themes. The memory consumption was also bound and only changed when editing and saving.
So this look like an issue that may have been specific to the affected system. As there have been no confirmations in three months either, I suggest reducing the bug severity.