[konsole] [Bug 371688] New: Underlines appear too low, do not show up consistently, and sometimes persist after clearing the screen

[flarn2006]

https://bugs.kde.org/show_bug.cgi?id=371688

            Bug ID: 371688
           Summary: Underlines appear too low, do not show up
                    consistently, and sometimes persist after clearing the
                    screen
           Product: konsole
           Version: 15.12.3
          Platform: Other
               URL: http://unix.stackexchange.com/questions/318909/how-do-
                    i-fix-this-text-rendering-issue-in-konsole
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: flarn2006 at gmail.com
  Target Milestone: ---

User-Agent:       Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0)
Gecko/20100101 Firefox/49.0
Build Identifier: 15.12.3

When something tries to display underlined text, the underline doesn't always
appear, and when it does, it appears too low, on the top of the next line
rather than the bottom of the current one. Sometimes, underlines are visible
even after clearing the screen, resulting in what looks like random horizontal
lines in the blank space.

Switching windows often affects whether or not underlines are displayed.

Reproducible: Sometimes

Steps to Reproduce:
1. Type 'cat' at the shell prompt in Konsole and press Enter.

2. Press Escape, and then type "[4m" without quotes.

3. Type some lines of text and pay attention to when underlines appear.

4. Press Ctrl+C, and clear the screen.

5. Try opening a man page with underlined text, such as "man chmod". Press 'q'
to close the man page. Try this a few times, sometimes scrolling or changing
windows while the page is displayed.
Actual Results:  
When typing text in "cat", underlines don't appear until the next line is
displayed. Underlines are commonly also seen disappearing upon changing lines.
Changing windows causes currently-invisible underlines to be displayed.

When clearing the screen (such as after closing a man page) underlines
sometimes remain visible, despite the underlined text no longer being present.

In all cases, underlines appear too low. This is probably the root cause of the
issue, as it is outside of the bounding box for the current line.

Expected Results:  
After typing ^[[4m and pressing Enter, text should appear underlined as it is
typed. Underlines should always appear under text that is supposed to be
underlined, and they should always go away immediately upon clearing the
screen. Underlines should appear within the bounds of the line containing the
underlined text, even if there is no room to do this without having it touch
the text—it is okay if the underline touches the text.

The font I am using is 12-point "PxPlus IBM VGA8" from this site:
http://int10h.org/oldschool-pc-fonts/fontlist/

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