Attempting to paste something that would exceed breakpad's text-area's character limit (like GDK/GTK errors) does nothing, which can be confusing. It should either give a warning message or paste the first N characters that will fit.
We might be able to fix this by inserting only the text that will fit when we cancel the text insertion event here: http://mxr.mozilla.org/mozilla-central/source/toolkit/crashreporter/client/crashreporter_linux.cpp#442
Summary: Attempting too-large paste in breakpad does nothing → Attempting too-large paste in crash reporter client does nothing
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