[gdb/testsuite] Fix gdb.tui/long-prompt.exp with read1
When running test-case gdb.tui/long-prompt.exp with check-read1, we get: ... (gdb) FAIL: gdb.tui/long-prompt.exp: prompt size == width + 1: \ end of screen: at last line ... The problem is in these commands: ... Term::command "echo \\n" Term::command "echo \\n" Term::command "echo \\n" Term::command "echo \\n" ... The last one makes the terminal scroll, and the scrolling makes the expected output match on a different line. Fix this by replacing the sequence with a single command: ... Term::command "echo \\n\\n\\n\\n\\n\\n" ... which avoids scrolling. Tested on x86_64-linux.
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