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Created attachment 100783 [details] screenshot - red line hidden by tabs The red line denoting the right margin is hidden if the margin width is exceeded using tab characters. See attached screenshot. Note that lines 1268-1270 appear different. I experimented with spaces at the margin to see if this issue occurs with other whitespace. A space (or any non-tab character) at position 80 or 81 causes the red line to appear normally. - Line 1268 has a space at character position 80. - Line 1269 has a space at character position 81. - Line 1270 has spaces at character positions 80 and 81. This may not be limited to Windows 7, but that is the only OS I can test.
*** This bug has been marked as a duplicate of bug 140120 ***