Description of problem:
When the text passed to zenity --info contains "<=", zenity issues an error message on stderr but then displays an odd information dialog.
Feed the output of some "rpm --requires" to "zenity --text-info".
Steps to Reproduce:
1. RPMOUT=$(rpm -qp "rpmfilename" --requires)
2. zenity --info --text "$RPMOUT"
An info window stating "All updates are complete."
stderr: (zenity:5416): GtkWARNING **: Failed to set text from markup due to error parsing markup. Error in line nn char xx: '=' is not a valid character following a '<' character; it may not begin an element name.
An actual zenity error window, or no window at all.
Substituting '\<' for '<' does not help. stderr indicates zenity tries to interpret the input text as xml, so apparently the "<=" needs to be escaped beforehand somehow.
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