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For fixing a previous issue #38004,
state.canvas_texscreen_used
was reset to false at the start of each render_joined_item in PR #38200.This was causing a later shader that used SCREEN_TEXTURE to force recapturing the back buffer immediately prior to use, which we don't want, in issue #43644.
This PR preserves the state across joined items, and also prevents joining of items that copy the back buffer as this may be problematic.
It turns out that the original issue that needed the line now appears to be fixed (by other improvements since), and the later issue is also fixed by removing it.
Fixes #43644